Being bullied

I’m a senior high school student, 16 yrs old. When I entered shs, of course i met new people. At first, they are so nice to me. But days passed, we’re became closer. That’s why they have the guts to tease and insult me about being flat chested. They’re teasing and humiliating me everyday! It hurts so much. I just came to the point that i don’t wanna go to school anymore because i’m tired of being laughed by everyone. But then, i realized that i’ll just look weaker when i went to the corner and cry. So I stand up and started to fight back. Because I know, that I should invoke my rights and show them that I am strong and not sensitive anymore.