I am 15 and I can t put my foreskin down , could someone help me?!?
It's normal for you to not be able to retract your foreskin until around age 16. Start stretching it - NOW.
Get an erection and pull down on the shaft skin so that the glans (head) spreads the opening OR use your fingers. Do it as often as you can. It may help to do it in the shower as the warm water helps soften the skin.
Normal erections and masturbation will also help.
Ideally, your foreskin should slide easily up and down the shaft when erect.
FYI, your glans is going to be very sensitive, almost painful, at first. This is normal and you will get used to it.