I had problems from worrying to much constantly when I tried to get decent at swimming recently. I think I might have taken lessons for a year over a decade ago, but I forgot almost everything I learned so I was eventually only able to swim by just flailing around inefficiently in a way that does not resemble any stroke. A few months ago, I decided that I actually wanted to be able to swim quickly, dive, and tread water as long as necessary without exhausting myself. So I went to a pool every week after studying a guide, and spent a few hours drilling the movements until I no longer felt on the verge of drowning constantly. I learned more slowly when someone was teaching me because it made every failure feel worse, but when I was motivated to improve and willing to look like an idiot in the process it went quite quickly. The more I assume that I should already be good at something, the worse I am as a student, which is something I really need to fix.