I had the opposite problem. I'm uncut and remember being a child and having a very sensitive gland. DUE to the fact that foreskin covered the majority of my cock's head, I had tremendous sensations down there. the doctors answer? WASH IT with salted water and masturbate a lot.
maybe in YOUR case you should just NOT masturbate for a while. RELAX about it, or try to stimulate the gland using your hands, producing new sensations to it.
at your own risk YOU may use tighter condoms, or even a cock extension with some sort of spined interior head, so when your with a girl, she feels pleasure and YOU do too.

HOPE this helps.