Mine is 4.2 inches soft, 5 hard
i am also fifteen. i have an average size of 4.3 flacid and a 8.3 COMPLETE boner ( the hardest it normally is) there is nothing to worry about. my friend made off with a girl in our grade, Courtny Parker (best ass you will ever see) do not me to sound like a jerk. he only had a 3 inch boner and she did not care. she is also the most popular kid in our school. also if you are worried about popularity, don't be. there are football players that i practice with, (football NOT masterbating) and when we end up showering, they have on normal 2 to 3 inch flacid, (not boner) and are not afraid to admit that they have only a 4 to 5 inch boner and have laid many girls. Most of these guys are also seniors in highschool. Overall, never worry. Hope this helped :)