I left school when I was 16, best decision of my whole life, got to spend a year relaxing then I enrolled in a hospo course, doing what I love, I couldn't ask for a better outcome.
I used to get bullied all the time too, I just fought back, but I don't think that's a good idea, schools seem to think fighting back is worse than the actual bullying, especially when you break a bullies face.
Quiting school is good!