Interesting info. I can relate to those feelings. It can best be described as excitement to be at a fun party, mixed with an overwhelming feeling of angst. (as an example)What's the overlap between introvert and just being socially anxious / self-conscious etc?
They're not the same thing, although it seems they often get used interchangeably.
But I know enough introverts to know the difference: some cringe at anything where they are centre of attention while others seem to suffer no embarrassment at all.
As I understand introverts, they are sensitive to dopamine levels in the brain, so when they go out and dopamine rises they get overloaded, hence the need to find a quiet, calm space to bring things back to an even keel.
This could be several hours into the party or within five minutes, depending upon the sensitivity.
Extroverts have no such sensitivity.
There's another chemical (can't recall the name) that is more of a mellow buzz that is released during things like introspection, daydreaming etc.
Introverts like that more mellow buzz, something they can enjoy while not getting too overloaded, whereas extroverts have no real reaction to it at all, like an alcoholic drinking shandy... just doesn't do it for 'em.
Going to look up this other chemical release that you mention.