Is size 7 in jeans fat for some 5"1?

I have been told it isn't by many people I just want some more opinions. I am 15. I have quite a muscular set of legs and arms but my belly havs a little weight on it. Not a lot, just a little. I think I have an apple shaped body. I just want to know if I sound fat and if my jeans are too big for someone my size. I am 139 pounds but everything is muscle except for my tummy.