Im 16 and my penis is abit wierd any help, im gettiing abit

Im 16 years old and my penis is 5.5 inches. my problem is that in like all porn ive seen all guys have there foreskin up to the like umm normal place. my foreskin when erect gets nowhere near there and if i try and pull it down it really herts. will this become normal.

here is a pic http://s196.photobucket.com/albums/aa75/christo999/?action=view&current=untitled.jpg