Don't know if this is a real or troll post but giving you the benefit of the doubt I'll answer. At 15 you are still growing in height and the length of your penis will change too. Height does not necessarily equate to length. Your penis will still be 'maturing' for a bout 1-2 years after you've reached your final overall height. You're only 15.... you're still growing..... you're going to be fine.