I really need a book

Does someone know a book where the main character, at first, is a normal person, maybe bullied, but not on the wrong path, but later he gets in an entourage with bad people and become a thug? I don't want something like yeah, he was an A+ student but stared smoking and know he kills people but realized is bad an stopes, no, I want something that feels real. Sorry for my bad English, is my 3rd language and I'm still learning how to write correctly.