I am 13 and realized that i need to retract the foreskin. How often shoud i do it and shoud i keep it back? And do i masturbate with foreskin?
Yes you need to retract your foreskin so you can clean your penis properly.
When trying to retract your foreskin don't force it back and hurt yourself just pull back easy on it doing it when you are taking a bath will help make it easier.
Once you are able to retract it you should do it everyday and clean under the foreskin proper hygiene is very important and should be done every time you shower.
Masturbation is your choice and having a foreskin or not makes no difference it's just your choice if you want to or not.