Newsround has asked 1,000 children aged six to 12 across the UK what their lives are like.
One in five of you said you feel unsafe on the streets, four out of 10 of you are scared of the dark and lots of you also said you're scared of bullies.
After bullying, lots of you said getting stabbed or shot was your biggest fear.
So what do you worry about?
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"I'm worried about the swine flu."
Benny, 12, Kent, England
"I worry about my parents arguing and splitting up. I also worry about who I'm talking to on the internet, and if they are really who they say they are."
Chloe, 12, Stockport, England
"I'm scared of being in a plane crash or anything where you can die."
Katie, 11, Scarborough, England
"I'm really worried because I have Sats in 3 weeks!!"
Zainab, 10, London, England
"I worry about not getting good GCSE results and being moved down a class because I am in the highest class at the moment."
Jane, 12, London, England
"I worry about tests and my friends and family. Also I worry about the credit crunch and getting hurt by people in gangs."
Shannon, 13, Bristol, England
"We have a park next to us and there are always loads of fires in there, set deliberately. At night that's where all of the gangs nearby hang out."
Ellie, 12, Glasgow, Scotland
"Gangs - they really scare me."
Mollie, 10, Liverpool, England
"I am really nervous with SATs, but I am even more nervous about the swimming lessons I am going to have, because I am the only person in our class who can't swim!"
Sindurii, 11, Oxfordshire, UK
"I am nervous about my SATs (two weeks to go!). Not particularly the exam but that I might get a low score and my parents would be disappointed."
Khira, 11, England
"I am always worried when I see teenagers in the park, even if they don't look like they carry knives."
Sadia, 10, Coventry, England
"I'm worried because there's a new girl in my class and she's hanging out with me and my bezzie and I'm feeling left out."
Sophie, 9, Weybridge, England
"I'm really worried because I have Sats in three weeks!!"
Zainab, 10, London, England
"I really worry about being attacked. I've been attacked four times by three girls that I'd never met before and for no reason. My parents and their school sorted it out but I'm still scared now."
Katherine, 13, England
"I worry that my parents might split up and that I won't do well in my school end of year exams."
Sophia, 12, Cambridge, England
"I'm scared that people might hurt me and I worry that people might get taken away."
Chloe, 9, Milton Keynes, England
"I'm worried about my English Standard Grade exams which are less than two weeks away!"
Callum, 14, Lanarkshire, Scotland
"I'm scared of being bullied and teased at school because I'm shy."
Natalie, 10, Nottinghamshire, England
"I'm worried about the Sats in two weeks but when I asked older people about it they said they felt exactly the same and they still did well."
Said, 14, London, England
"Anyone worried about Sats, don't! I did them last year and they actually are okay! So don't worry."
Claudia, 12, York, England
"I am scared that one of my friends is going to get hurt or even worse, killed. I am also scared of being attacked. I feel unsafe on the streets unless I have three or four friends with me - and even then I still worry."
Steph, 13, England
"I am worried about little children getting bullied on the street. They might not be able to cope with being teased by older people."
Amal, 10, London, England
"I have got Sats in two weeks, which is giving me butterflies in my stomach!"
Helen, 11, Leeds, England
"I'm so worried about my Sats, it's so not fair that only England has them!!"
Tamsin, 10, London, England
"I live in a rough part of Newcastle, so some of the teens and gangs scare me, especially on a Saturday night when a lot of people are drunk!"
Thomas, 10, Newcastle, England
"I've got Sats in two weeks and the teachers are making a big deal of it - I wish they would be quiet about!"
Megan, 11, Sheffield, England
"I worry about knife crime and gangs. I worry that I might get killed or that one of my family or friends might be."
Amber, 14, London, England
"I'm scared of being abducted or killed. Also I'm scared that my family will be hurt."
Dawn, 14, Rome, Italy
"I worry about things like bullying, money, changes to my body and homework but most of the time I worry about crime."
Bethany, 11, Bradford, England
"I don't get worried about anything."
Sophie, 9, Ireland
"I worry about street safety. I don't feel safe on the streets at all."
Hannah, 13, Middlesex, England
"I used to be scared of everything, I was anxious and I worried a lot. But I feel much better now that I am more positive."
Mehreen, 11, Surrey, England
"I've got my Sats in two weeks and I'm scared I'll get rubbish results. Also I have asthma so I worry about having an asthma attack."
Bridget, 11, Staffordshire, England
"I'm worry about the end of the world, you never know it might happen anytime."
Philip, 9, England
"I'm scared that I'm going to get bullied at secondary school when I go there this year."
Georgia, 11, England
"I get scared about going out at night because teenagers shout and get drunk. I'm scared that they might stab or hurt me."
Anya, 12 Milton Keynes, England
"I'm scared of guns and knife crime. It's getting worse every year and I don't go out that much because of it."
Ryan, 12, Kent, England
"I worry about being kidnapped and taken away from my family. Also I'm worried about gangs and bullies."
Julia, 9, UK
"I'm scared of death. I'm also scared of crime because I don't understand why people need to hurt each other. I'm also worried about GCSEs because we have far too much pressure put on us."
Annika, 14, Notts, England
"I'm scared of being lonely."
Natalie, 12, Essex, England
"I worry about the my big test in two weeks."
Harry, 9, Cumbria, England
"I worry about my belongings when I'm going to somewhere big, like a city. I'm worried that someone will snatch them!"
Laura, 11, Northants, England
"I try to follow this Roman proverb; 'Death is coming and he would say, 'I'm coming soon, so live today'"
Kayleigh, 14, Wiltshire, England
"I worry about of lots of things! Such as someone breaking into my house or losing my family, murder, gangs on the streets, choking, worms, needles, hospitals, being away from my home at night, the car crashing if we drive in the dark, tests, good grades, bullies, being alone, fire, getting old, dying, embarrassing myself, heights. Also my cat is having babies, so I'm a bit worried about her too."
Tayler, 13, UK
"I worry about racism which goes on at my school. I hate it, it gets worse day by day."
Marium, 14, Worcestershire, England
"I'm worried about secondary school, growing old, money and my family!"
Laura, 12, Ireland
"I'm scared of animals, the dark, ghosts, monsters, scary films."
Lucy, 12, London, England
"I get worried about sitting tests and my test results!"
Rose, 10, Norfolk, England
"I worry about lots of things! In fact I worry about everything!"
Anisah, 10, Edinburgh, Scotland
"I worry about a whole lot of things. I hate walking on the streets in the dark. I'm scared of something terrible happening to me, my family or friends."
Sophie, 13, Sussex, England
"I worry about something bad happening to my family. I worry that I might be unhealthy when I am older and get bad diseases or illnesses. I also worry that I will never get a boyfriend!"
Jasmine, 13, UK
"I am scared of something bad happening to my friends and family."
Louise, 13, Staffordshire, England
"I have a serious worry that I will drown!!"
Natasha, 12, Dorset, England
"I really hate gangs of teens just hanging around in the street. It makes me feel really uncomfortable and scared."
Jess, 10, England
"I am scared of losing my friends. I also hate exams and the idea of looking stupid."
Sienna, 13, London, England
I'm worried about my future and what job I'll get."
Charlotte, 11, Nottingham, England
"I worry about getting killed, grades, tests and blood. I am very scared of blood and I get so nervous that I have been close to fainting."
Emmi, 12, Prague, Czech Republic
"I am scared of something bad happening to my family."
Madeline, 10, Berlin, Germany
"We don't worry about anything. Be happy because everything is going to be alright."
Class 7OP, 11-12, Birmingham, England
"I am worried about my friends messing about and sending nasty messages on MSN."
Lucy, 9, Greater Manchester, England
"I worry about global warming, university, my siblings and their education, my grandparents and my parents."
Kathryn ,13, Istanbul, Turkey
"I'm really scared of all the usual stuff like the dark and spiders, but because I have asthma I'm scared of having an attack in my sleep."
Amy, 12, Maidstone, England
"I'm scared of bullies, the dark, gangs, trains and heights."
Freya, 12, Maidstone, England
"I used to worry about bullies but now I'm home schooled. But the thing I worry about all the time is getting stabbed or shot - it REALLY scares me."
Suzanne, 13, Hertfordshire, England
"I am always scared of older gangs of boys especially."
Rosie, 10, Wales
"I'm scared of being on the streets and I've got Sats in two weeks, so I'm a little bit worried about that."
Emily, 11, UK
"I worry about loads of things but in particular I worry because my best buddies have recently left and now older kids bully me."
Elin, 8, London, England
"I am scared of dark corners in the street because anything could be there!"
Alex, 8, England
"If I go to the shops and it is late. Sometimes I see people drinking and worry, because they could do anything to you. Also, if I leave my bike outside people could take it."
Amy, 11, Milton Keynes, England