How do I have sex?

I'm 23, fit, always getting requests from guys to hook up, but my stupid generalized anxiety disorder is preventing me from having any type of relationship with a guy (bf, casual sex, even having coffee together is too much ). I've kind of accepted that I will never have a bf but I would love to hook up with a guy from time to time and have my needs satisfied. There is a guy that has been chatting with me for several months now but the anticipation kills my mood and usually I end up ignoring him or blowing him off (not in the good way). It's not like this would be my first time having sex but that doesn't help my anxiety in any way. How do I deal with this? There have been complete hotties that I would die to just be able to see let alone have sex with, but my disorder is preventing me from having any fun/life/relationship. Has anyone gone through something like this? I would love to be with a bro that's there for me but I doubt that will ever happen :(