When people who are very lonely find themselves in social situations, they often second-guess themselves and hold back from showing who they really are. It's as if they're standing behind a pane of glass, watching themselves interact with other people. Their overall sense of disconnection seeps into their socializing, which leads them to overthink what they say and how they say it. They tend to criticize themselves for how they acted. This negative, repetitive thought process falls under the category of rumination.

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