Can't retract foreskin at all. The hole on the tip is very small

Edit: I can only see a tiny bit of the top of the glans.

ask ya mom to have a look at it for you son..

Pull it back as far as you can without hurting yourself. So it feels like it's stretching and hold it there for several minutes as often as you have time to do it. It will work better if you can sit in a bath tub of warm water to soak it while doing this. It also works better if you have an erection because it has something hard to stretch against.

It may take a few weeks to see any improvement. Skin stretches slowly.