Do you think that I'm fat? Should I lose more weight?

Hi, I'm 14 years old (almost 15) and I am a competitive dancer so being around skinny ballerinas always made me feel like an obese nothing. I am 5 foot 7, 150 lbs, a size medium in shirts and a size 8 in jeans. Starting in February I was a size 12 or 14, XL in shirts and 175lbs. Do you think for regular teenage standards I am fat? Do you think for dancer standards I am fat? If so, how much weight should I lose?