How Can I Get My Mother To Remove My Bedtime?

My mother is so mean to me. Probably because I am her first child, but I can't get her to remove my bedtime. I am 16 and every year she pushes it back half an hour. It is currently 10:30 Sunday-Thursday and 11:30 Friday and Saturday, even in the summer. It really messes up my state of mind. Such as when I didn't quite finish my homework, I still have to go to bed. None of my friends have bedtimes and I am a sopre in a vocational school (those are hard to get into). She knows I'm smart and can fend for myself, but she insists on my bedtime. I can't take my cell into my room or any form of entertainment (she checks for that stuff). I don't know what to do. Can you please help?