For me it’s time signatures in music. I grew up playing instruments, played in several orchestras, etc. But no matter how many times someone tries to explain time signatures to me, it makes no sense. I don’t understand why people place such importance on it. To me, notes have a pitch and a duration, maybe some dynamics. That’s it. I don’t understand why people try to needlessly complicate it. It doesn’t give you anything.
My wife will hear a song and go “Oh neat, it’s in 5/8.” And I’m like “How tf do you know that, and why does it matter?”
Dancing. And even something like swaying or tapping one’s foot to a beat is hard for me unless the song makes it super obvious. Most people seem to just intuitively get all of this. Plus I don’t have good coordination or spatial awareness, where I still routinely run into doorways in my home and such. And then add social anxiety on top of all that. A nightclub might as well be a torture chamber.
Have you tried taking a dance class? I recently started one for the first time, it’s nice. You’ll be in a room full of people who also can’t dance, which helped me a lot with my fear of dancing (poorly) in front of people.