Is it normal that i fear having sex?

Alright, let me break it down. I try to be the most decent guy I can be. :D But sometimes, there is just that day where I get all tensed up and horny (sorry to be obnoxious) and just have this urge to... Might I say it? Grab a girl that I like like and do wonderful things to her. I just love the idea of feeling boobs (though I've never done it), I love the idea of sex. I enjoy the idea of people having sex. I don't know. It just seems wonderful.

BUT.

When it comes to me having sex... I just have this fear.. Or I tend to get grossed out at times at the thought of ME having sex. Not others having sex. ME. I love girls and everything, I'd love to participate in the act of foreplay, but.. I just can't see me actually doing the deed. IIN?

Thanks anyone.