How do I mak muscle this muscle smaller?

Ok so, my calves are alright but the top of my leg on the side of my leg is so bulky, im 14 its probably because im a dancer, ALL my friends say im skinny, but my window reflection and mirror reflections make me look big, I would try a diet, but my parents say im skinny, and i know they lie but they still wont let me... any suggestions :/