Should I stay friends with this girl who's my best friend?

Alright, meet Macy. Tall, brown curly hair, brown eyes. She gets whatever she wants, complains about EVERY SINGLE FREAKING THING, commanding, greedy, and really mean. Macy says she's only mean to people who are mean to her friends, but I've began to see that she's mean to anyone is particular. She makes fun of country singers because she says they have no lives, and hates almost all of the bands I like. Even if she does like the bands I do, like Breaking Benjamin, she acts as if she's their biggest fan! Macy says my taste in movies, music, and men suck because I LOVE musicals with all my heart, I listen to anything and everything thats not Metallica, I hate My Chemical Romance, because they're old to me now, and I'm a fan of people wh have real talent, like Alan Rickman, Johnny Depp, Gary Oldman, David Thewlis, and Brandon Lee. She NEVER lets me listen to music on her computer, and when she does, it's always gonna have to be what she approves of, which is MCR, TheComputerNerd01, Fred, or the Annoying Orange. She loves getting into trouble while I, on the other hand, is reluctant. I'm a nice girl, but I do have a bad temper. I'm always her underdog, the puppy. She always turns off the computer at my house when I try to listen to music that I'm intrested in, such as HIM, Soundgarden, and various Wizard Rock bands. I like Harry Potter, she likes Twilight. Macy is my best friend, but I'm starting to think she may just be a bad influence on me. She's always getting into trouble in school, and I'm just the girl who doesn't do her math homework. Macy's always having friends over, and when she does, almost completley ignores me! I want to be friends with her, but I'm not sure. Can you help?