Not everyone has to be a writer, but it of course helps if you want to say something on a social media platform. I don't think you should be beating yourself up about it, because you don't have to write if you don't want to. Well, neither do I, but because this is my "job" and I know it's beneficial to write well.
This platform is not the greatest place for someone who would only want to share paintings or pictures, one masterpiece every once in a while. Not if they are expecting to get paid handsomely for it. But what I do see a lot of, is artists sharing progress photos and talking about their creative process, that is something I find very interesting!