I'd be interested to know if you are going after pretty/shallow girls and maybe that is why this is happening, you are basically doing what they are doing to you in a roundabout way by rejecting a type of girl.
That was directed at the OP, I suppose, not me. However, I feel a need to comment on this. :
Damn... just be patient and don't ask so many girls out. Just wait for a girl to give YOU a sign that she is interested. People always act like the men have it harder, having to ask the girls out; that men are the initiators, but it's not true... Girls initiate with their body language! Learn how to read it and you wouldn't waste your time asking girls whom are not interested. Personally, I can just feel it in the girls' auras what they think of me, but I don't ask girls out. I don't want a girlfriend at this point, but they sure as hell are crazy about me even though I am unconfident, extremly skinny, shy, and just plain wierd. I'm just patiently waiting for that special someone. In fact, they ask ME out and I tell them NO. Why? Because I don't want a girlfriend. I know that doesn't make sense. It's not really advice unless you understand the body language I'm talking about, but to keep it simple, for someone like you who is actively pursuing girls: don't waste time and tears on the ones you know aren't interested. That's all the inane drivel I have to say on the matter for now.
Haha. So, you are saying that girls ask you out indirectly by giving you body language cues, and you catch up on those and reject them by not asking them out? Sorry, but that sounds like you fabricate a sense of attraction where there is none. Body language is absolutely not reliable - unless it's overt, but then it's usually negative. If it's positive, it was clear that there is attraction and that long before the body language became noticeably expressed.
No girl ever asked me out, and that's kind of clear, given the passive nature of women. That's not a problem, but that implies the only proper course of action: Asking women out yourself. If you don't do that, it is most unlikely anything will ever develop.