If the school officials and your parents can't resolve the matter then you have the option of going to the police. Intentionally breaking someones nose is a reasonably serious assault.
I think psychotherapy may also help you better manage your emotions and help build skills that may better help you deal with situations.
That does not mean that people have the right to bully you though.
this is a tough situation, tough for anyone to deal with...I think you will have to decide what to do based on what is best for your future...it sounds like you are almost out of there, and going to a new school with a fresh start..it will be helpful to figure out why you have become an object of bullying like this, and figure out how to avoid that in the new place.