Welcome to HCM,
If you can not avert your fore skin of penis ans is very tight then you are having Phimosis
and requires Circumcision
Many a time due to collection of smegma
skin become adhere to glans
and it becomes difficult to avert the fore skin.So if there is smrgma collection then try to clean the part gently and remove smegma.
Consult surgeon and get examined and do according to his advice.
Ok and bye.