Why do I feel like every girl is checking me out?

Anonymous
I don't know if any other guys experience this, but some days I feel like every girl is checking me out, then others I feel like they don't even realize I exist. Surely there can't be such a sharp contrast in my appearance daily to where I'm hot one day and not the next. So which do I believe? Why does this happen?
Why do I feel like every girl is checking me out?
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