I think I was about 13 the first time I did this, the thing is, my foreskin would easily fully retract when I was soft but when I got hard my dick seemed to get too big for the skin to expose my bell end. It still does it, when I am soft it is fine but when I am hard it only exposes about half of it and won't stretch anymore. It has never caused me a problem but I just wish it would strech! I have head of something called phimosis but I have seen pictures and my problem does not seem to be half as drastic as that, I can easily expose my head when soft but I have never been able to too when hard!!