There's a kid at school that I really want to beat up.
That seems really violent! Why do you want to beat up this kid?
He's bullied me and insulted me. It's really driving me crazy.
As someone older you should control your temper and not use violence. Using violence on a kid who insulted you is an extreme way of dealing with problems. You should talk to their parents about their behavior.
Their parents aren't really attentive, I don't think they'll do much to help the situation.
I know you're upset but you have to get your anger under control. There could be serious consequences for you if you harm this child. Talk to the school about his behavior and see if they can intervene.