I've recently learned that I have Avoidant Personality Disorder. I spend most of a conversation looking for ways to end it quickly before I make some sort of social faux pas that I'll obsess about for the rest of my life. (I still replay moments from 30 years ago in my head. Like I said, it's a disorder). The better a conversation is going, the faster I want it to end. Any exit I see, I take it.