There is white stuff on my glans. It seems my foreskin is stuck to it. How can I solve this problem?

Removal of smegma from the glans is easy if you do it regularly. But if you do not pull your foreskin back every day it accumulates, becoming a sticky mass between your glans and foreskin. If this remains in place long enough it becomes impossible to pull the foreskin back. It seems that this is happening to you. Pull you foreskin back as far as possible and remove the smegma. Use soap and rinse this off well. Pull it further back every day, but stop when it hurts. See if you can remove all this sticky stuff in the next few days. If you are unable to do so a visit to the doctor is necessary to prevent the glans from becoming inflamed and infected.