Actually, The problem is which i concluded to be is founded on this very website:
Foreskin Frequently Asked Questions
DO I actually have to pull back my foreskin THAT further back? No wonder why.... I didn't realize that it had to expose the head of my penis. at that time during the sex, the foreskin was just at mid section of the tip of the head.. NOW I have to pull it ALL THE WAY BACK?! O.O IS THAT RIGHT?