Why do men act uninterested in me even though they are attracted to me?

I've seen some men checking me out and staring at me. However when I talk with them they seem to be very quiet, don't make a lot eye contact and look at other women. Sometimes I feel that they go out of their way to show me that I'm unattractive and boring even though I know that this is not the case since they act like this from the very beginning when they haven't had enough time to get to know me.

Why do they act like this? I never try too hard since I'm not attracted to any of these men.

Why do men act uninterested in me even though they are attracted to me?
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