In my experience, very, very few girls can offer the emotional commitment that a guy could. I am not saying that men make better friends than women. I am, rather, saying that of the people who can be great friends *to me*, the majority of them tend to be men. I am open to the possibility of a great friend-girl, but I am not holding my breath.
OP, you don't know this girl. You are projecting too much, in all likelihood. And she probably will not be able to live up to your crazy expectations, once you do muster the courage to say hi to her, make her laugh, spin her around, and instantly take her on a date.
As others have said, you probably don't talk to enough girls. Talk to more girls. Every cute girl you see, go say hello. If she seems cool, ask her out, and *then* take her number just to confirm the date.
It looks to me that you do not have issue with dating but rather with putting a particular girl on a pedestal for a certain period of time. I used to do that too. And it's bad. It's a little like loving a cat you played with at the pet store for 2 seconds because you are convinced it can do tricks that it can do back flips and play dead.
You can't love people you don't know (!), but you can be attracted to them. And I think what's going on here, is when you finally find yourself attracted to one girl, you try to further rationalise why you should be with them.
As for soulmates...I think that's a flawed concept. I don't see why of all people in the world there has to be ONE of them, and conveniently, you will meet that ONE person somewhere in your day to day life or on a trip to Belize. Maybe there is such a thing as "soulmates" but I disagree with the idea of there being ONE. This severely limits yourself. There are so many girls all over the world, and so many of them could be *your idea* of a great girlfriend, or the perfect girl.