When I pull my foreskin back part of it gets stuck on the glans/ head

Hi Hugh,

This is normal until about 16 or so.  Start stretching.  Get an erection and pull down on the shaft skin so the glans spreads the opening OR use your fingers.  Do it in the shower, the warm water helps soften the skin.  The more often you do it the sooner you'll be able to retract.

Hope it help.