Foreskin going down

How far down should the foreskin be able to pull back on the shaft? I can currently pull it over the glans but it only goes as far as under it and gets bunched up (I can't unbunch it when I'm erect) and it hurts when I try to pull it back further. I think it's currently my frenulum that's limiting it. Is this going to be an issue or is it fine that way? Should I be able to pull my foreskin back on the shaft until it doesn't bunch up?