the teachers at my school are stuffty at that kind of thing
Tell the headmaster, tell your parents, tell the police.
All of these things are valid to do.
If you're being bullied and no one is doing anything about it then you have to take it to the higher authority.
If asking them to stop won't do it, then go to the teachers.
If the teachers won't sort the problem out, go to the headmaster.
If the headmaster won't sort it out, tell your parents.
If your parents won't/can't sort it out you could tell the police. What they are doing isn't legal.
And if you want it sorted in the school, then write to your school board of governors and explain how no teachers nor the headmaster have helped in the slightest with a very distressing problem.
Job done.
If you go and hit them then you'll be in worse trouble if all they've done is call you rather harmless names.
