I'm in 8th grade,and a girl wants to fight me, she keeps pushing and yelling at me,i'm a guy,but if she attacks me should i defend myself?

Hmm, that's a new one on me. When I was in school, I always dealt with a bully with a blitz attack as soon as he started to confront me, I'd punch him hard in the 3rd button area, then in the nose. That made it difficult to breathe and see at the same time, then I could continue to punch or walk away, because I had really already won by the attack. They don't expect that. They expect you to cringe and try to avoid a confrontation. I never had a girl try bullying me though. I think I might still do the 3rd button attack that takes their breath away.

Just kiss her square on the lips so she at least has a good reason to belt you next time. She may just be doing it because she likes you. If not, you will at least get a kiss out of it.