Thomas Thompson killed himself at his home in Wallasey, Merseyside, on Wednesday.
His mum, Sandra said her son had been bullied for a few years. She said he was a bright boy who didn't like sports.
Thomas wanted to be a science teacher and often attended anti-war rallies.
"He was a good kid, a good laugh, but a bit different from other lads of his age, " Sandra said.
A spokeswoman for Kidscape said how important it is to tell someone if you're being bullied, like a friend, a teacher or a parent and keep telling until you get the help you need.
She said it's harder for the bully to pick on you if you have a friend with you for support.
Thomas's mum said she can't forgive the bullies:
"I have no words to describe the people who persecuted and taunted him ... They can hang their heads in shame."
Head: 'no reports of bullying'
Thomas's headmaster Martin Pope said he was shocked by what had happened.
But he said the bullies weren't from his school.
"He (Thomas) didn't discuss concerns about bullying and there were no reports of bullying in the school", he said.