Unfortunately, this is a sad sad sign of the times....
Kids want results, QUICK.... No-one is prepared to put the long hours in, the correct nutrition and sleep and tie in the whole package... and this isn't a personal dig at you 'killerexp' - like I say, it's just the way young folk are nowadays...
I've got a lung infection - I need antibiotics...
I've got a headache - I need an aspirin
I've got a sore back - I need tramadol
The sad and simple truth is - everybody thinks the answer, and the quickest remedy is in a pill or an injection.
Don't get me wrong, I'm no angel, and I never will be... but if I knew at 18 - 25 what I know now - I wouldn't have done half the things I've done, and as a few people have already stated, you have everything you currently need to get big right there already! A young man's 'natural' testosterone level, a young man's metabolic rate, a receptive and responsive body... all you need to do is train clever, eat clean and lots of it, sleep well - you will grow!
Enjoy all those things while you have them buddy - cos once they diminish - you'll miss them - BIG TIME!