Guys don't flirt with me much?

Guys don't seem to come up to me or flirt with me much. Could it be that I'm too shy? I know that I'm not ugly (not trying to be cocky). I can be kind of quirky, and I'm smart. I'm nice and am a good girl for lack of a better word. I wonder if they think I'm not interested? Any idea?
Guys don't flirt with me much?
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