Basically my foreskins hole is so small, imagine a 3mm diameter, that I can't get the head of my penis out while flaccid or erect, I can masturbate no problem and I can urinate no problem although there can be a bit of splash damage at times. There like a bunch of skin next to the hole and while I can get erect I'm wondering if that is after hindering my size as I'm only 4 inches long and quite thin. 
tl;dr I'm incredibly worried that my foreskin has hindered my growth and I shall die a virgin!