Hey bro, don't let it bother you that much. Let the tickling lead into sex. Trust me when i tell you tickling is the best form of foreplay. You just have to be gentle and can't be an aggressive tickler. If your nice and easy, that'll turn you on alone and she'll probably get a little hott from the tender little touches. See how it works from there. And i wouldn't get down in the dumps about it, after sex you'll realize its a pretty fun thing, lol.