Rate your social skills on a scale of 1 to 10. Then tell us the ways in which you're socially deficient.
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I give myself a 6 (though others will probably disagree). I think I'm mostly pretty good, but once in a while I'll say something pretty stupid.
I also don't act cool, but not in a "too cool to be cool" way. More of an "actually not cool" way.
Furthermore, I absolutely hate walking into one of those parties where everyone's mingling, and you've got to either go up and try to work your way into one of the conversations, or chat up one of the other losers who's standing alone.