
Mate, you have years of natural progression ahead of you. When you reach a point where your not seeing real gains over a 12 month period....maybe consider AAS. This could be at 25 or 30 or even 35!!
This. I did a cycle at 24 and still think I was too young. I don't think I recovered 100% from where I was before and I'm getting ready to get bloods to prove/disprove. Nineteen is too young bro. You want to gain wait, watch your diet and include a mass gainer shake, do more legs. You can easily put 5-7 lbs on your legs in a short time by proper training... If your legs grow, so will your upper body!
I can't believe that God put us on this earth to be ordinary. - Lou Holtz