Loads of you have been victims of crime - in fact, a new survey says it's a fifth of all 10 to 15-year-olds.
But half of you are too scared to tell anyone, in case you're called a grass.
The new survey was done because the government does not have official crime figures for those under 16.
It also found that:
- half of the victims knew the person who did the crime
- a quarter were targeted by someone their own age
- over 750,000 of you have been mugged for money, mobiles and clothes
- over 80,000 suffered a crime involving knives or guns
The survey also found that telling someone about a crime is seen as uncool and a hassle.