I didn't allow them to get the best of me. Instead i just simply ignored them. I never got in any altercations, or any of that nature. It was not necessary, it never is. As long as YOU like yourself, then there is no reason to feel ashamed, bad.
You can try talking to a teacher, or even a close friend. Also if you've told your parents, and teachers about the situation, and they haven't done nothing, then there is a problem. Stress the problem that you have, take a stand.
I wish you the best of luck!
*hugs*