This is gonna get me in trouble as this is a boxing site but if you want to stand up to bullies and be able to take care of yourself without getting excluded from school or in trouble with the police take up Judo.

I was bullied at school and took up Judo. Also it teaches you discipline so you are less likely to get in an altercation with someone due to your ego. However if physical needs to be employed then Judo is far and away the best for of self defence/confidence building/stress conditioning. If you learn to punch properly aswell you will be one dangerous young man.

Good lukc