Comment by Freak_NL
> […] so it's highly unlikely that anyone will want to beat you up again.
That is, unfortunately, not how this works. The only ways to stop bullying are to be able to stand up to the bullies, which usually is not a realistic proposition (you wouldn't get bullied in the first place if you could) and can lead to further escalation (right on up to shootings or stabbings); to have a very, very empathic teacher who will put their foot down; or to have solid anti-bullying programs which use effective, proven methods to stamp out bullying.
Mind that nothing will deter a really determined bully, and getting punished because your victim spoke up instead of accepting the bully's power will escalate things from 'bullying just because you are available' to 'bullying because I now want you, and specifically, you, as miserable as you can be, all the time'.
From my experience with school bullying it was an entirely social problem. If the rest of the classroom agreed that you shouldn't be bullied then there were few ways for a handful of kids to go against that consensus, and most of them would backfire on the would-be bully.
Of course, if you're young and you have no friends, good luck getting your peers to think you're worth defending.