Social group question- strangers?

I think that when people look at me a lot when I don't know them, smile welcomely and genuinely at a social gathering, or make eye contact when I look at them in NYC it means that we are part of the same social group. Correct or incorrect? Because sometimes I think people like me that way but I think they are a little out of my league. If I am not imagining all of this what should I do to improve my chances in making it with that crowd?
Social group question- strangers?
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