Relax dude. You sound perfectly ok to be. If you have a few pubic hairs, puberty is knocking on the door for you. You are still WELL within the normal age range for puberty, just maybe a little later than your friends. I wouldn't expect to have any sperm until 3-6 month or more after you really have noticeable pubic hair and penis growth. Think of it this way though, you can still have all the enjoyment of masturbation without the annoying clean up! Bonus! Anyway - hang in there, you are absolutely 100% normal, and before you know it everything will catch up to where you think it should be. Until then, just enjoy every day and try not to worry about something you have no control over!