Floundering (and not the cute fish from The Little Mermaid..

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Anyone else feel like all of the sudden they are an adult going through puberty again? Or maybe not puberty but high school? I'm having a hard time learning/relearning how to do things that "normal" people have been doing for years ... like taking compliments gracefully. And dating (not being in a relationship; just going out on a couple dates. Also: how to express that you're just not that into him ...). How has anyone else dealt with this?