First of all: Don't ask a teenage forum for health advice. Pretty much all responses saying "Eat a lot and stay in bed" are rubbish. My advice would be to have a healthy diet, without any junk food, but with larger meals. Keep a regular workout scheme as well. And remember that workout can be more than lifting weights (hiking, swimming, soccer, etc.). Don't worry too much about your weight if you're still in puberty. Your metabolism will do all kinds of crazy stuff while you grow. I could eat 4 times as much as everyone else without gaining weight (but I was a big guy with about 183 pounds and 6'1"). Eventually it will stop.
My advice would be to ask on some health forum instead of here.