I am 13 years old and 5'1 I have always thought I was fat....Oh I forgot to mention I'm 99 lbs.. but I lose weight fast by I have have 1 belly rolls and it drives me crazy but my doctor's say when I'm sitting it looks like belly rolls because it's my muscles relaxing...but I just think I'm fat....I don't watch my carbs because I don't eat a lot of sugar but I do a lot of running 5k every night before my daily shower...please someoner help me AM I FAT OR UNDERWEIGHT? ALSO GIVE ME TIPS TO MAKE MY SELF NOT LOOK FAT!