To this, I actually kept a log for a while, on the basis that some people do tend to remember negative experiences more than positive. And indeed, it was interesting to see how I remembered events after a few weeks vs. what I had written down on the day, and it was useful to try to be more aware of this. As a learning experience everyone ought to try this for a short period.

But I don't think introversion and social anxiety is the same thing, though I absolutely buy that they probably often co-occur. To the extent I have any social anxieties, they are very specific and limited, and don't really affect me much, but the energy drain of interacting with people does.