Solve my paradox... why am I single?

Hello everyone :) I'm a male.. I'm not ugly, I'm not stupid, I have a lot of imagination and I want my own family and children. My weakest point: I get pessimistic if many failures come my way. Anyway... I'm 27 and single... I want a serious partner beside me. Girls don't seem to notice what I want or what I am. I don't know where I could find a serious woman today... I'm sure there aren't many left. Advice please. Thanks.