How can I change my body shape? See details?

I'm 14 years old and I'm 5'3" and I weigh 106 pounds. I'm a dancer and I have very strong legs. I have thunder thighs. I have really strong butt muscles too and on top of that I have a fat butt. My tummy on the other hand, is nearly flat. My boobs are size 30A. My upper body is quite thin while my lower body looks chubby. When I was like 10 I was really chubby and then I lost a lot of weight (I went from 50 percentile for weight and 25 percentile for heigh to 25 percentile for weight and 40 percentile for height). When I lost weight I thinned out more up top and not so much on the bottom. I hate my body. How can I get thinner on the bottom? I need to like lose muscle.