How much weight should I loose, im 5'9", 150 lbs., 16 years old?

right now I'm about 150lbs., I think I should loose like 20-30 pounds. Do you agree? my legs are pretty muscular from being a dancer but I still think I look fat and my size is way bigger than any of my friends, I have friends roughly the same height who are way smaller than me (weight/size wise). I heard that being 5'9" and 16 years old means I should be way less than I am but I'm not sure.