What's wrong with me that men never make a move?

27-year old woman, single for four years, living in a major U. S. city. I recently found out from a mutual friend that apparently five different guys within our friend group have had crushes on me in the past couple of years or so since I moved here. But literally none (ZERO) of them thought to express any kind of interest, make any kind of move, etc. They're now all with other partners. This is incredibly frustrating, and the only conclusion I can come to is that I just didn't inspire enough attraction in them to have them actually make a move. Literally, in the past 4 years, I've only had one guy (at my old workplace) come up to me and actively flirt and try to get to know me.

In terms of looks, I generally fit the "attractive" mould, though probably in a more generic sense. 5'8, 130lbs, natural blonde, green eyes, long legs. Is this part of the problem? Am I too generic looking to inspire intense attraction in men? I have hobbies and a good job that I enjoy, so I don't think it's some major personality flaw...
What's wrong with me that men never make a move?
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