I know this isn't the right sub but you guys seem to be a little more...educated!

Okay. I'm 13. This girl I know at school keeps hitting me. No, not playfully, literally *full power* slaps me. Wherever/whenever she wants. I told my parents and a teacher but to no avail. I only get "Did you hit her back?" (I didn't) or "She's a girl you can't do anything." What do I do? Should I fight back?