probleme with army bct?

[PabloE]

I AM 16 years old THE probleme is that im skinny but i can do sit up 62 in 1 minute and i can keep going fine i do push up and pull ups and jog 3 miles i eat a lot, more than my FATHER AND STILL I CANT GAIN WEIGHT ANY TIPS OR CAN I GO TO THE ARMY LIKE THIS PLEASE HELP