When I was in my twenties, I didn't think marriage sounded that great either. I am 42 now and love being married. Here are a few thoughts:
* I really understood the desire to marry when I found someone who was right for me. My wife and I are highly compatible. It is great having a teammate in life. I had many relationships which were good, but didn't rise to this standard. All the time, I think about how much I respect and value her.
* I value stability for my children. I love my children more than I could ever have anticipated, and the home we create for them matters a lot to me. Also, there is no one else who understands your parenting project the way your spouse does.
* My wife and I laugh a lot together, usually just before we fall asleep or just after we wake up. The intimacy and comfort is fun.
* For me, I didn't like the idea of marriage until I was ready for it. What I mean is that when I was young I wanted to work all the time, and I felt poor and was constantly worried about money. By the time I met my wife, I had had enough career success, and had enough savings, that I was ready to be really generous without feeling stressed about it. I mean generous in the broadest sense: with my time, with my emotional security, with my financial resources. Marriage seemed more threatening or risky before I got to that point.
* The 'contract' is negotiable - we have a prenup. That said, I don't ever expect it to have any meaning for us, but don't get hung up on that.
I could name a lot more reasons, but those are the main ones that come to mind.
My advice is: Keep trying to meet a lot of people. Eventually, you will meet one who after a year or two makes you say "If I could lock this situation in, I would be ecstatic," and she will feel the same way. Then, marry her! The day I got married, I couldn't believe my luck. Many years later, I feel far more lucky than I did the first day.
Also, I love this essay on marriage:
http://www.slate.com/articles/news_and_politics/slates_10th_...