Gaining

Chubby or fat

I wouldn't call you fat at all. Yeah your chubby but that's it. Even at 200lbs ou would still be just chubby. The weight on you is looking so good.
13 years

Chubby or fat

What's your BMI? (If you don't know, see: www.nhlbisupport.com/bmi/).

A BMI of 30 or more is considered "fat". It's not a perfect indicator, but if you have an average build and are not particularly muscular it should give you a ballpark idea.
13 years