Before yesterday I had never retracted my foreskin and it never happened automatically (and still hasnt)

I thought that it wasnt supposed to until a few boys in my class mentioned it.

Anyway, its hard to do when erect, but from what i've read if i retract it when soft for a while it'll be easier and start doin it itself i go to the toilet or gt an erection, right?

Also, the head is really sensitive. And it hurts if i touch it.
How can I make it less sensitive, cuz if I wank, its gonna hurt

Thanks