The Mind Of A Fat, Ugly, Bipolar Freak of Nature

I've known this girl since we were 6 years old. She's an only child so she's always been spoiled and self centered. I've always been shy and quiet so I guess she loved being around me because I let her talk and be loud. But there's only so much a girl can take. I've been making changes in my life in the past year and letting go of people who aren't good to me. But i dont know why i dont know how to let go of this girl. I do not enjoy talking to her or being around her. I've tried to tell her countless of times that I wish she would let me just talk and tell her about my life but she s never going to change. I dont know how to stop being friends with her but I don't feel good about myself when Im with her. And thats not what friendships are supposed to be about.