So this phenomenon has a name! The Yerkes-Dodson Law.
https://en.m.wikipedia.org/wiki/Yerkes–Dodson_law
“The law dictates that performance increases with physiological or mental arousal, but only up to a point. When levels of arousal become too high, performance decreases.”
Reminds me when I practiced athletics and had my first competition. I couldn’t for my life do anything right… Dropped out of the endurance race, had a false start on the sprint and threw the weight in the wrong direction.
The worst was the high jump. During practice I was doing really well by being able to clear 1.9 meters (6.2 feet) but during the competition I was not even able to clear 1.4 meters (4.6 feet)… performance anxiety is very real!
For me it’s the ability to type. Someone starts watching and immediately every other character is a typo.
Or worse, they compliment you…
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Wow … that’s a lot of talent … mine is more of a wisp or thin formless vapour that you’d hardly notice
Been playing guitar for decades and can play fairly well. When someone watches me play I look like I just picked it up yesterday.