Testicular Pain Advise?

I doubt very much that the pain I am having is testicle tortion because the left testicle is lower than the right and testicle tortion is meant to have the testicle with pain to be lower than the other. These pains do not occur rarely but not commonly either. It is pain in my left testicle (pain occurs randomly and hurts more when touched on surface or round the back of the testicle. I was just wondering because I am only 15 and puberty only started for me June this year (2009), and armpit hair is under arms (ish), has grown, hormones, and so on whether it is just growing pains because I can tell that the left testicle is a bit bigger than the right testicle. My right testicle seemed to have had the same sort of pain but less painful the other day, as in it was growing pains. This has been happening since about Octoberish, which was when hair down there and was growing. Cheers.