For me, it's messing up/ doing something socially unacceptable or hurting someones feelings without noticing. In my life I've done this many times, and the times it happened the worst were when I was having a lot of fun, and had no idea I was doing something wrong. I'm the king of miscommunication.
I had a long history of this, especially as a kid, and because of it for a long time whenever I was having a lot of fun in a social situation I'd suddenly remember past times when I messed up, and then I'd go down in a self-doubt spiral and it'd kill my fun and start acting weird.
that living in the deep south and having awful social skills will lead to me either regretting trying to be friendly to 99% of the people i interact with on a daily basis or lead to me to being lonely until i can move places