A heavy athlete

I'm 13, I'm an athlete, I'm 5'5.5", and I'm about 127 pounds, I feel overwheight,for an athlete.

I'm skinner that the other people in my class, but at lacrosse, I'm one of the heaviest people there. I feel so ashamed, especially because we are in sports bras the whole time. I've tried so many things to lose wheight, what should I do?please help!