not sure if height alone is a good reason to be on hgh , i remember when i was little 40 years ago my mom asked the doc about my height (right now i am 5 5 something like that) and i remember he asked for some tests and upon these tests he decided that hgh is not recommended, i was not a tall kid but i was sure a very strong kid (ironically i was the best in high jump and long jump in my class as a kid for a long time). i have two other friends who went on hgh as kids, one grew tall and the other did not seem to be affected at all ...he is now my height. so OP at 5ft6 and 17 years old is not that bad at all .....many Mr Olympia contenders and champions were not even 5ft 6.i think hgh has some serious risks and should be taken only in pathological cases.
height is not and should not be a problem and op must not be affected by such superficial things, just go to the gym and enjoy life.