OKay i am going thro the same thing, and i have told my mom too, she allways tells me I'm nat and not to think that, i mean i wouldn't call myself over weight, but not the skinniest girl in the corld,Yes maybe you don't think excizing is working, but you might have to excersize it will keep you look as you are now, don't stop excerszieing, and don't look at your self in a negative way, God will allways see you as his child, and i am sure you are a beuatiful yound lady!