hey what concert did you go to?? i think it's great that you're not considering AS at your age take advantage of the free flowing test in your body. it's not cool to flame someone for trying to improve them self man. your back is starting to develop, and it looks like your abs are developing nicely too. keep it up train hard, and eat, eat , eat. it's gonna take time, but the gains are going to come.
good luck!!