hurm your helt? dude i started when i was 18 u will be fine i know a lot of people who have, back in the early 90's everyone started early and they can make u taller because of the nitrogen balance just never take them pre puberty like 13 or 14 or u will be like lee priest and hes not even that short, as long as you are taller then 5'6 then you will b fine, i only took sust and deca at 18 and cyp so i dont know if that stunted me but i swear everyone was like are u getting taller i was like i dont know