Lana, I'm sorry that you feel bad. Many women go off to college and hope to meet and marry after graduation. I know only one couple who actually did that. At 21, I had very little experience also. There is nothing wrong with that.
It can really take a toll on your feelings of self-worth if you have unrealistic expectations. Do you want to get married right after college or do you want to marry the right man at the right time? I think the latter. Focus on yourself, your happiness, and your education. The rest will fall into place. A friend of mine had a similar dream. She wanted to get married right after law school, and she did. She soon became a mother. Within a few years, she became, as 33girl described, a divorced single mother.
I'm rambling a little, but my point is life is not hopeless. There will be wonderful things out there for you. One day you will meet someone who wants the same things as you. it is definitely worth waiting for Mr. Right.
Right now you are in pain which is understandable, but this too shall pass.