There´s no harm in acknowledging that trying to do something new can make us feel babyish again. It was my own inability to pick out a nursery rhyme by ear, in my 20s, capable of playing dots “like flyshit on the wall”, that set me on this path of finding a different way of learning to play. Slow down and enjoy the experience. If you think of the months it took learning to crawl, then learning to walk, it´ll help you be patient before you start running. Mozart used “Twinkle twinkle little star”, known to him as “Ah, vous dirai – je, Maman” for a set of variations, which just goes to show that there is nothing too modest, or too well-known, to be worth playing.