I feel your dilemma deeply. Left to your own devices, you'd probably be emotively catatonic in these situations, but to ease the awkward moments and avoid being called a sociopath, it seems better to be an animated weirdo. I've certainly been there. But it leads to questions like this one - how long to hold a smile, how frequent and intense should eye contact be, how long can you maintain your balance before the cumulative stress of the performance leads you to cross a red line or commit a faux pas.
I guess I don't know you and shouldn't put thoughts into your head. But I do know that the question you raise has no answer, and tends to spawn more questions with no answers.
It's a question you should best be asking yourself, but what if the least necessary performance is the best one? One where you're a quiet but intense listener, ask more questions where you might otherwise concoct statements, be perceived as a strong silent type and over time accepted as thus?
Some time ago I made this transition and deleveraged myself of these questions that follow contrived performances, and the inner peace dividend has been enormous.
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"Conceal a flaw, and the world will imagine the worst."
- Marcus Aurelius