Well, good news is you're too young for court. Bad news is the moment you "head toward" and initiate the attack you're fully to blame for your actions. Depending on the school and how far that kid's guardian push it, you're looking at suspension to expel. Best you can do now is gathering every evidence you got of the bullying and let your mom know so she know the full picture and be prepared for the meeting. Don't let your mom go in there unprepared, she can't defend you without knowing what's going on and got ambushed with their version of events.