I'm 5'7.5" and weigh 115... how can i lose weight quickly?

I'm 15. I'm a ballet dancer and a dancer at my height should weigh 110 and I really want to weigh 110 so how can i lose 5 lbs. Please don't give me some stupid link. I exercise at least 3 hours a day in dance or gymnastics.. sometimes more than that. how can i lose the weight i need to lose to look skinny