I did not learn writing formally, and I do not publish what I write. But I do write a lot, mostly fiction to express the things that happen to myself in a controlled environment.

I tried not writing in chapters, but I find that the chapters helped me compartmentalize different times and places and specific subjects. It may be that I'm simply used to chapters from reading other books, but no matter what the book I find that some sort of compartmentalization is beneficial and often necessary.