I think I may never be married?

I am 20 years old and have had severe anxiety. The severity of the anxiety has caused me to have no social skills at all and not even my family knows what I went through in school. I'm not exaggerating, this is how bad it is. A past mental therapist thought I had asperger's syndrome, but later concluded I didn't that my social level was so low from chronic anxiety as a child and growing up. I am not vain when I say this but I am an attractive person. Amazingly attractive girls have in the past come sit next to me and say your hot will you go out with me. The problem I have made those dating experiences hell and relationships that lasted not even a week. No one has ever liked my personality and theres nothing more that I crave than to spend my life with someone who loves me and I love back. I feel cheated that I can't connect with anyone. Many times an attractive girl has flirted with me and with the past experiences in mind I didn't do anything about it because I thought nothing would happen and her leaving me because of how I am would hurt worse than not doing anything. I don't know what to do anymore