What do you think of this problem, please help me, I really don't know what to do.?

Ok, now this may seem a little strange. I congratulate you if you make it to the end, it is really long. Let me get to the point. I just entered high school and i go with a school bus. There is this girl in my bus whom I have been enemies with since the first day we met. The girl's name is Amy. She is in the senior class in high school and is just about to write her major exam to enter university. I don't really remember who started the fight but it is very strange that a girl who just entered school could be enemies with one that is about to leave in a few months. Anyways, I am always fighting with her and she really does not like me. No matter how much I try to reason with her she never lets me. Anytime I see her and try to tell her good luck in her exams she shows me an attitude and says "leave me alone child!" But at other times she shows signs of liking me and being really nice to me. One time we actually played a game in the bus together. And there was another time when students in my bus were harassing me and she stuck up for me. Yet she bad talks me 99% of the time with her friends and always bosses me around. Help!!!!! I love her, yet I hate her at the same time. I really do not know what to do. Is she my friend or my enemy?