This is like I wrote it. The sad part for me though is that I probably am a lot older than you. I am 32, female and up till this day I've never had a boyfriend. I'm never chosen. I'm always left to sit and watch other people spin around me, having one relationship after the other, being happy with whoever.
All this "advice" about picking new hobbies, expanding your social circle, going out and stuff....I've done it all. I've done EVERYTHING in the book on how to meet people. To this day I have numerous friends. Lord do I have friends!!! I've been with them from the time they are single, then attached, then engaged, then married and then vanished once the kids appear. I meet guys, sure. All of them find me "so cool" and "so much fun" to be with. They all see me as a little sister, or a "friend". Nothing more. The guys I happened to like are those that ran the fastest away from me, canceling me even as a simple friend.
I've been trying to understand this misfortune of mine ever since I was 20. I'm not that ugly. I'm quite normal looking, I'm a really nice person and I always try to make people around me happy. I'm also extensively educated as well: 2 masters and 1 PhD. Sometimes I feel as if I'm just continuing to study only because there is never something else to fill in my empty life.
So far all the good years have passed, the "good" decade of my youth and nothing ever happened. "He" never showed up. "He" will never show up. I'm 32 and nobody ever "saw" me.
So there, you are not alone in this one. I'm willing to bet though -especially if you are younger than 32- that things might turn out quite fine for you. At least this is what I'm hoping for you.