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Well see, my girlfriend is really tight, and it hurts her when I fuck her. Do you know of anything that could help... loosen her?
When a woman "gets ready", the vagina produces lubrication and opens up a little. A lot of gents, like yourself, experience difficult intercourse because, while the woman may feel mentally ready, the body hasn't been given enough time to prepare.
I would advise you spend awhile on foreplay the next time you two are together, and see if anything changes.
It might also help to get a good water-based lubricant and maybe a clitoral stimulator so she can relax into the sex act without subconsciously tightening herself up.