I'll play along, since this is an Angie topic...
Personality type: Turbulent Adventurer ISFP-T
Individual traits: Introverted – 68%, Observant – 69%, Feeling – 67%, Prospecting – 56%, Turbulent – 85%
Role: Explorer
Strategy: Constant Improvement
I like that you're very conservative in almost everything, not extreme measures - that is C.John to a tee, if I've ever read anything.
A really good friend of mine is super outgoing, can talk to literally anyone, the life of the party, knows people everywhere, etc, but he absolutely needs his "**** off and leave me alone" time. He comes out as an introvert in any Myers-Briggs analysis he's ever taken, but if you knew him casually, you'd never guess it.
I think most people thing I'm an extrovert! I generally know someone wherever I go - that's a really accurate way to put it. It's absolutely just needing that "**** all y'all" time. Talking to people is great... but wears you out. I bet that's how your friend is, too.