If your stats are what you say they are it's all about math. Branch Warren is 300lbs in the off season at about 9% body fat at 5'7. I would say do some cycles with aas with the proper coaching if you are dead set on doing it and see if bodybuilding is the road you want to take. If you already have the hgh and you're gonna take it no matter what we all say, start out low, like 1iu per day for 1.5 months then go up to 3iu and run that for at least six months and see what your body does with it. I personally think youare too young for hgh if your stats are right. Naturally you should be putting out 3iu hgh per day if you eat right and kill yourself in the gym. I'd say don't do it for at least a few years, but if you'r like me you would have already started. Be safe youngster.