Why can't I be truly happy?

Here’s my situation. I’m a 23 year old male living in philadelphia, PA. I have a good job and and good friends. Everyone tells me I’m a great guy and very nice to be around. My question is…

Why can’t I find my ‘dream’ girl?

I don’t like to think of myself as shallow…all I’d like in a relationship is a woman whose body is matched only by her mind: Brilliant. Sadly…the only attractive women around here are about as dumb as a brick…or smart and cute but they don’t ever go out into public.

I’ve tried different approaches in regards to starting a relationship…

-Aggressive, a$$hole-ish,jerk
-Passive, shy, nervous
-Somewhere in the middle, taking my time, but making sure my intentions are clear.
-Not doing anything and waiting for something to fall in my lap.

Any advice would be great because I’m starting to get it in my head that I’m just not companion material and I’m going to be alone for a loooooooong time.