Are these bad body stats?

I'm 19 years old, 5'10.5, 170 lbs and I wear a size 7/9 in junior's pants and a shirt size S-M in junior's shirts. My bra size is like a 34 B or C. I always feel super gross because I'm tall and wish I could wear a size five, at least. Sometimes I can. My legs are pretty much all muscle, but women in my family store fat mainly in the abdomen. I've also lost about fifty pounds a few years ago, maybe my body doesn't see me as thin yet, or maybe I'm just fat.. D: