"And I happen to meet a girl who wants me to have sex with her from before the first date, when I would have prefered to getting to know each other the better. How can somebody live so against the current? (I'm talking about me)."

I'm pretty much the same way, I think. I have intimacy issues, too. Anxiety and OCD just murder sexual stuff, but I've been able to make do, to a point, in the past - as long as I feel comfortable and trusting with someone, then it tends to be OK, as long as my anxiety/OCD is kicking up a real fuss. I've been also been single for quite a while, but at least you've had some sort of intimacy.

I think you need to work on yourself, get some professional help, before thinking of relationships; that's kinda what I've been doing. Now I'm in college, working out a ton, living in a new place on my own, getting support in life, and now it seems I may be getting a warehouse job (which could later develop into "IT Technician") which is ideal for me.