I'd like to second stormgirl's closing point, there... you are very young, and inexperienced with relationships. You're still learning how to get to know another person. The kinds of hopes and expectations you are projecting onto those you meet, those are thoughts that shouldn't even be an issue until WELL down the road into a relationship.
You are unique. Your partner, when you find each other, will be unique also. And yes, I remember the sense of urgency you describe, but you just have to trust us on this: at 21, you are NOT falling behind in some sort of relationship horse race. To my experience, most people at 21 aren't really ready yet to fully understand a real relationship. This is your life, not some movie. Don't view each person like a casting director: say hello and see what happens, without expectation.
What is real will blossom. Just keep your heart open.


With much affection.