For me it was pronouncing the letter “R”. If there was anything positive about it, it was that it was such a miserable thing that I made myself learn how to do it. Sounds like your experience was similar.
Ugh! Terrible memories of having to go to speech therapy in elementary school. The teacher would actually announce in class that it was time for my therapy and I would have to listen to the other kids snicker as I got up and walked out. I don’t know why she didn’t just give me a dunce cap and make me an even bigger target.
For me it was pronouncing the letter “R”. If there was anything positive about it, it was that it was such a miserable thing that I made myself learn how to do it. Sounds like your experience was similar.