Hi lori,
hope you don't mind a guy replying, just would like to give you a male perspective. By the way, i'm not a sexual predator so don't worry, i'm a 29yr old married man!

lol
ok, so first of all I reckon the chance that your boyfriend even notices that you have, in your words, an "oversized vaginal lip" are about a million to one. And even if he did notice, the chances that he would care are about 10 million to one. I think you are crediting him with too much knowledge of the female anatomy. Vaginas come in all shapes and sizes, that is the beauty of it. If every woman had the same vagina then for guys it would be a bit like opening your christmas present every year knowing that it contained a pair of black wool socks! In other words, very dull.
As the owner of your vagina you have lived with it all of your life and have had time to scrutinize the tiniest of details. Your guy has not had the opportunity to do the same and will not be spending time down there measuring your vaginal lips. He will doubtless be so pleased and excited to see your beautiful body that he could care less about such small issues.
Like a previous poster said, I have never had a guy conversation where we've compared or criticised the appearance of a women's vagina. It just isn't a concern of ours. Our main criteria, as would be your criteria for us, is cleanliness/hygiene and general maintenance. As long as those are in order then we are just chuffed to bits to be able to be with a woman in that way.
So really you need to stop worrying. Above all this, remember that your body is yours alone and is not for judgement by others. Your vagina is yours, nobody else's. Be proud of what you have, and expect others to value your body too. If they don't then that's their loss.
I really wanted to leave my final cliched statement to the end but it has to be said. Any guy who goes off you because of the appearance of your vagina would have to be a total and utter waste of oxygen and you would want to be as far away from him as soon as possible.
You will be fine, I guarantee it, and you will make your guy very very happy i'm sure.
All the best, take care....