Whenever I decided to write a blog post, I realize how terribly I know the topic and how worthless it is when finished. So writing for myself doesn't make sense

Whenever I decided to write a blog post, I realize how terribly I know the topic and how worthless it is when finished. So writing for myself doesn't make sense. If I would write it for my close friends, I would rather make conversation with them about this topic, but then I'm not sure how beneficial those conversations would be since it's not topic that they are educated enough. So making blog for my friends about topics that they are not interested enough doesn't make sense to me either. Only reason why write blog for me is to manage my notes and write down my thoughts. But I can do it privately as well. So it brings me back to first. I would say you need some kind of narcissism to write blog.