I would say it was semi-natural for me. I learned at some point through various medias that being uncircumcised means there's skin covering the tip of the dick. I wasn't very sure how that works as I never got any talks from my dad and we didn't have proper sex education at the schools I went to. So, being as naive as I was around the age of 11, I thought I was circumcised as I could take a piss with no difficulty. (I'd thought having foreskin meant I wouldn't be able to take a piss because of the skin coverage... very weird logic, I know.)
I believed that for years and because I never had problems with it so I sort of forgot about it. That is until the wonder that is porn entered my life at around the age of 16. The first time I saw a porn actor got his dick hard and pulled back his foreskin I realised there was something wrong with my whole conception of foreskin. That I actually had them on the tip of my dick!
After that it was pretty much down hill. Several failed attempts to roll it back and keep it behind the head as every time my dick got hard I had to roll it over the head because of the associated pain. Internet research and support forums taught me about stretching it and soon enough I was rolling it back with ease.
Well, that's my story.