How can I lose my stomach fat and feel better about ME?

I have been doing ballet for 3 years and I am going to start bellydancing as soon as our post recital break is over. I feel very uncomfortable with my body and I know I am on the right track by eating healthy and exercising, but I am only seeing my stomach grow instead of shrink. I feel very fat compared to all the other ballerinas and even my best friend who is just a little toothpick. Why can’t I be naturally thin? Somtimes I wish I was anoerxic, and wish I could be but I can not make myself puke. How can I lose my stomach without hurting myself? I just want to be comfortable with me!