Cannot be answered directly. The most telling part is that, "I am nervous with her as well."

Has this happened with others? Has she "addressed" the problem?

yeah you have to trust the women your with.

i have embarrassing issues i have to deal with and my first serious relationship i just had to learn to trust her to not hurt my feelings and not make fun of it.

what you will learn is everyone is different and everyone has odd things about them that makes them unique.

my embarrassing issue is more cosmetic. I have a hidius birth mark on my ass. seriously it could be mistaken for those black ink cards therapists use.

the women i have slept with when they say: "why does your ass cheek look like that" i just laugh and say "i was born like that....quite strange i know" and then they say the same two things. "its cute" or "it makes you unique" the truth is its hidius but human nature has a loop hole called perception. Perception trumps reality bro. then i just change subjects. if shes gonna find me less attractive or less of a potential mate cause im physically not a staple of perfection.....then she can get out of my bed and stop wasting my time.

so trsut this women and trust her interest in you. she is making out with you cause she digs you mate, not cause she hopes your a staple of perfection.

take the next step, and if you have troubles just talk openly and honestly about it without shame or embarrasment. have confidence and just accept that there are some things about your body you cant control and have confidence that she likes you enough to take that challenge head on and you will find a way to correct this "not as embarrassing as you thought... situation"

The problem did not arise with others in the past but it seems to be a constant with this woman. Only you can know what is going in your head - that, incidentally, is the center of all sexual response.