why do i have a small penis?

im 15 years old and am 2 inches soft but when am errect im 4 inches long whats wrong why wont my penis grow?

[Caryopteris]

The average penis is between 4 and 6 inches.  

If it were me, I would optimize my testosterone by working out with weights.  I don't mean work out until you can't walk normally, but just add some nice muscle tone everywhere - arms, shoulders, back, abs, thighs, calves.  That's how you naturally up your testosterone.  Maybe that will cause extra size for you, and it certainly won't hurt you if you do it carefully with proper lifting technique.  You will get respect from the guys and admiration from women.  And by keeping your body fat low, you won't lose any length to fat.  

Despite what you hear, every study I've read states that more women prefer an average penis to a large one.  You will find some women fit your body and some don't.  It's that way for everybody.  

[bobdylan1958]

   Hi please don't be hurt, but you are only 15yrs  but as you grow you will grow also in that department lol Chill Take care...........Bob

[karmaghia]

Your penise sounds to me like that is normal for now.  It will grow as you do.  Dont worry about it.