Don't quit school... Could you change schools if it is that bad?

When I was ... in school ... I had no problems with bullying.
I might have been bullying others.

I remember being called into a meeting where the topic was this small kid looking like a cartoon character. We used to call him Texas Kid because of his looks. It was never our intention to bully, but this was the way he percieved it. All it took was for a teacher to tell us: He doesn't like to be called Texas Kid, and we stopped.
Have you tried this approach?