Girl in school has bullied me for years and im a boy

I have gone to school with this girl Elle since the third grard. She has always been one of the popular girls since I can remember. In elementary school she would get bigger boys that liked her to punch me and beat me up. I guess she liked the power or something. But since middle school I don't really get physically beat up anymore but she keeps me as like a servant. I am a junior in high school now and am expected to drive her to and from school when her boyfriend cant pick her up. She gave me her locker combo and makes me get her books for all classes were in together. This last year I am not even allowed to say her name without calling her Miss Elle. We have study hall every other day and I have to file her nails while she talks with her friends. It is very embarrassing but the worst part is ive almost become uses to and just accept it now. When I do make mistakes or forget to do something she tells me I am usually slapped or yelled at in front of her friends. I don't know why she chose me maybe because im small or shy but I feel like she has full control of me and I cant even explain why

Hey, you may be young, but you're a future man, so stand up for yourself! Don't lose your pride, especially in front of a girl. She's probably just bullying you cuz you seem like the type of boys that's easy to bully and she likes feeling power. But you don't bend to her will. Tell her you don't like the way she treats you and that you won't do what she wants. Have confidence in yourself, put your head straight up and act like a man!