I'm 14.

A few weeks ago, I found out I couldn't pull my foreskin all the way back. I've been doing some "stretching", and it works fine now.
However, I can touch my glands without much pain, but if I move the fingers or take them off it, it hurts really bad.
I've heard that I should have olive oil on it, and that it should make it less sensitive. Does that work, and if so, how should I do it? Just have it on, or rub it (Now that would hurt).

I need to get it less sensitive as fast as possible.
Cause I'm probably having sex for the first time in pretty soon, and I don't want it to be painful.
So answer, please.