I was like you, I didn't think I would meet anyone. I didn't want and it didn't bother me. But, first day of college, I met a guy and we've been together for 6 months. And now I couldn't imagine life with out him.
What I am saying, is you adapt to your circumstances. Most women are natural born mothers, and they see that when they have a child. I didn't see my self ever getting married, but now I'm in a relationship, it's one of my dreams.
Try and not focus on whether you have or don't have a relationship. When you meet the right person, it will come naturally and you wont even realise it. But life isn't for avoiding things, it's for doing those things, making those mistakes and learning from them. Granted for people with social difficulties - like myself, and many other people - it's difficult getting out there and learning to let yourself make mistakes with people. But don't give up on the idea of a relationship.
If you think about it, we're all supposed to find the 'one', if you believe in that kind of thing. We can't find the 'one' until we've been through relationships and found out what kind of person will be the 'one'. Unless you're incredibly lucky and find this person before you have even had another relationship.
Like Stronger said, if you have a therapist, talk to them about it. I'm sure they'll have their buckets of advice.