As if it hasn't been stressed already...you need to eat bro. Eat good clean foods alot and all the time. At 17, your hormone system is running a thousand miles per hour begging for good nutrition. "Feed it and you will grow!!!!" Aside from a multivitamin, protein, and maybe creatine, supplements won't do you much good because of your optimized hormone levels right now. Use them and use them wisely. Diet is the foundation. If you have a strong foundation, your grow potential is, in theory, limitless. However, the weaker the foundation, the slower and smaller your physique progress will be. Learn from these boards and grow, don't live and learn. Take notice from all these people who have been where you are now.
Just my $0.02