I still wanna know what my body was doing with the extra ~2,000 calories/day I was feeding it from ages 14-22, a period in which I put on only a little height a

I still wanna know what my body was doing with the extra ~2,000 calories/day I was feeding it from ages 14-22, a period in which I put on only a little height and, by the last half, only gained maybe a pound or two per year. ... also I'd like to know how to get it to start doing that again. (yeah, yeah, I'm sure the answer is "take T and HGH, they're basically magic, aside from all the other health problems they give you")