most would probably tell you not to do AAS at your young age, and there are good reasons for that. do research, be smart.
very likely you see results of your training/diet/lifestyle change (BTW cudos to you), and you want more. I'd suggest you do blood test and see what's your current test levels are (free testesteron levels especially). At your age you are most likely way ahead of the curve in terms of hormones in comparison to older folks in here. You can accomplish in the next few years ALOT just by using your natural testesteron.
instant gratification is what's going to create many problems for you in a long run. a cycle at 17 may cause problems for your finely-tuned-turbocharged endocrine system (do the blood test to confirm that).
my $0.02 is that focus on training/nutrition.. break plateaus using your own arsenal of hormones (damn I am envious, I'd love to have test levels of a 17 year old:) only then, when you REALLY hit the wall and can't grow then AAS is the tool that go beyond what your genetics can give you. abusing it to get quick results WILL backfire.