Party of one

What is up with the girls that have been engaged a mazillion times? What is it about them? Are there some people that are just more marryable than others?
Is marryable even a word?
I am 31 and a half years old. I have never been engaged. I have only been proposed to once and that was by a leathery 30+ guy who was a day trader from LA who happened to meet me at a Hawaiian Tropic Pageant in Las Vegas. I am not sure why he proposed, or how serious he was. But that was the only time I have been proposed to.
I want to get married. I want to cook dinner for my fella and rub his feet and make him feel good about himself. But somehow I am lacking that "girlfriend" gene or that marryable gene. (there's that word again.) I guess I would not mind if I understood what was so fundamentally unappealing about me. Maybe not unappealing, but what was lacking in me that people want in a mate?
Hell, I have heard more excuses as to why people don't want to be with me than I have ever gotten requests for dates. And, not to blow my own horn or anything, I am kind of cute. I would like to think I am nice, and (maybe this is the big problem, because I think too much) I am not an idiot.
What is it guys are looking for? I have no idea. Maybe someone can fill me in.
But, if I hear one more time "It's not you, it's me." I am going to hurt someone.