I am 13 and in 7th grade...all my friends are like anorexic and when i'm with them i feel huge....i only weigh like 93.02 lbs. And i'm 5foot 1.5inch..is that normal or should i try and excercise more?I'm in a tumbling/gymnastics class so...i get a pretty good workout...please only GIRLS around my age..tell me your weight...THANKS!!