Why do guys approach me in clubs (AND I DON'T LOOK AT ANYONE. I ACT VERY UPTIGHT)?

All I do is dance. I don't even laugh or talk loudly. I don't look at anyone. My clothes are not slutty.
I know that guys always make eye contact and see if she looks them back they approach. But I don't look at guys. I act uptight.

Why do guys approach me in clubs (AND I DON'T LOOK AT ANYONE. I ACT VERY UPTIGHT)?
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