what are the best exercises for cellulite on your thighs?

im 13, so i really cant go to the gym. i cant believe i have cellulite on my thighs. its not too much but its still noticeable! what are some really good exercises for cellulite on your thighs? also, im trying to make m butt more slimmer and firmer...what are the best ways for that. i eat healthy and exercise too....i just need help!

thanks.