Ok, first of all I don't know why guys think this is SO important. Really, if you ask most ladies, they will tell you they care less how big a guy's penis is. It really doesn't make a bit of difference in lovemaking. It's not how big it is that matters, it's how well it's used. With that being said, I probably shouldn't have said that considering your age and the fact that you shouldn't even be making love! Just remember that for future rememberence! :)
Also, you need to remember that you're probably still growing and will continue to grow until you are in your twenties. My sister married young and her and her husband was 19. He didn't have any chest hair or anything at that point! He filled out more and grew more hair, etc. over the next few years.
One more, my dad was about 5 foot 7 inches in high school. By the time he was done with college, he was 6 foot 5 inches! He grew almost a foot in those few years! So yes, you could be and probably are still growing.
Hope any of this makes you feel better. Now stop worrying about it! Nobody but you cares! :)
im just bout 18 right now nd form experience im tellin ya youll grow a good deal over the next few years and you wont even notice it...just dont concentrate on it and it will slip ur mind to the point that when you remember you had a problem youll be like woohooo haha, jsut give it time bud