There is only ONE thing you can do, and that is GH shots. of course you have to take them when your around 13 or so, and have to go through testing before the Endocrinologist will even prescribe it, BUT if you're like me, and back in the 90s I was SHORT, and had a GH deficiency, THEN you can take them. I was supposed to be under 5' tall, and I am about 5'5 or so. Took them till I was about 16.
And don't tell me I am full of crap cause it does make you grow. But unless you are approved (even then its 25k a year and some insurance won't pay for it) then you better get it off the black market, but at the age of 13 I don't most could or would even realize they could. And for those that wonder its called Protropin and its made by Genetech