Introverts, do you ever feel as if you do not understand extroverts? Vice versa?

I’m currently dating an extrovert. Sometimes I am confounded as to his motivations for doing things. Even the reasons why he smiles are different from the reasons why I smile, at least in groups of people. He smiles first in anticipation of social interaction, again when someone begins talking and while they are talking, as if to say “Go on, you’re doing great.” Just talking to people, even if he doesn’t really like them, even if he dislikes them, makes him happy.

In contrast, I only enjoy talking to people who are interesting, who talk about things that I enjoy talking about, or who I have an emotional connection to. I smile after someone has finished talking, either because I enjoyed what they said as a way to express thanks, or because I hope that if they get the affirmation they are looking for, that they will stop talking.

Do you usually have relationships with people who are the same as you socially, i.e. introverted or extroverted?

What differences have you noticed between the way you think and the way extroverts/introverts think?

Or do you think that other things play more of a role? Do you think extroversion/introversion is overplayed?