Well dude what else CAN you do BUT get over it? If you're that hung up over it go buy a penis pump.

If you know how to set the mood right, and know to kiss a little here, touch a little there, and really can stimulate not just her body but her mind too - it's going to be better than just some big elephant trunk up her. Chances are that this guy probably relies on the size of his package to carry him through sex, so he probably doesn't do much for stimulating the mind before/during sex you know? So you could win there.

If he does though.. then well you're screwed and should get a penis pump ;p