I recognize people from really far away based on how they walk. As a teenager, it drove me nuts trying to pretend I didn't know someone was present. I'm realizing that most people don't do this, but for me, it really messes with my timing, as in when to say hello to people, which is another topic.....
Also, I often recognize deeper issues that are troubling people, where nobody else pays attention. I don't know how I can miss some really obvious things that everybody else notices, like status insecurity and jealousy, yet it is crystal clear to me when someone is socially anxious or in love with their best friend.
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I sometimes leave conversations and return after a long time. I am sorry about it, but I need a lot of time to think about it when I am not sure how I feel.