Why?

I am generally a very anti social person, however, I don’t see a problem with that, I take this bus that takes me to and from school, two boys would tease me about my breasts, that they are really big,and sometimes they would just try to annoy me, I try my best to ignore them. I got really angry and I almost hit one of them. I don’t like being teased, its not a good feeling. I need help, I’m too embarrassed to tell anyone because they’ll think that I’m weak. I don’t want to live like this any longer. I don’t know what to do.