Hi i am 15 and i was wondering if this was normal when i am flaccid i can pull my foreskin back all the way to the base of my penis but when erect it doesn't go back much unless i pull it back myself even then it only goes just past my glands and no further should it go back further say 3/4 of the way down? if so how can i fix this? thanks
It's normal, until about 16 or so.
Keep working on pulling your foreskin back. The skin needs to stretch some more.
Really, you are doing well with what you can do now. Many older guys don't know that their foreskin should retract.
Just pulling back on the shaft skin while you have an erection should be all you need to keep doing.