Well, there is nothing you can do with the pain for the first time. It is sort of an initiation for the female population. Be shocked if she doesn't hurt a bit and even found it pleasurable in the first instance. What you could do is to concentrate on other parts like trying to caress her. Try to be gentle and feel it if you are already hurting her. You might want to use some lubricant to help you further. Also, you might want to assure her that everything is alright, even if you are also unsure
. Nervousness could cause her not to produce natural lubrication and that would really hurt. This will help you a lot, I suppose
http://www.avert.org/faqypsex.htm#q5.
Good Luck!