you like, no matter what instrument you play, and no matter how good you are with the instrument, you are very welcome to come along and have some fun, without the added stress of performing for a live (and generally spiteful) audience. someone must“, might be a habit learned in childhood. when you are a small child, you really are a lot less experienced than everyone else, and it really does make sense to assume that the grownups know things that you don’t.
maybe that’s because nobody actually knows.
maybe that’s because you’re more capable than you think.
maybe that’s because it’s your job to figure out. 