I feel the same way you do. A decent portion of the time, I feel like girls just really aren't that interested in me. I have attractive facial features, but I don't know if I always give off the correct vibes.
What's worse (this is something I DEFINATELY have to work on) is that I can get goodl-ooking females interested in and attracted to me for a short period of time ( a day, a week, two weeks) but I can't maintain that attraction level and escalate properly.
If I can learn those techniques (and overcome my fears of rejection and being inferior) I'm set.