You are NORMAL. It is perfectly NORMAL for your foreskin to NOT retract before about 16 or so.
You can help it though.
Get an erection and pull down on the shaft skin so that the glans spreads the opening. You could also use your fingers to spread the opening in your foreskin.
You WILL find your glans very sensitive. That is NORMAL too. It has been covered and protected so is not used to being touched.
The more often you stretch your foreskin the sooner it will retract. Skin grows under tension.
Again, this is perfectly NORMAL. Good for you for asking about it.
Hope it helps.