Too many authors write stories about what interests them and not the people whom they expect to sell books to. A perfect example is autobiographies. I don't mean to sound harsh, but nobody cares about your life story unless you are a celebrity. Also, consider the benefits of fiction. Fiction allows you to be creative beyond your own experiences but still allows you to deal with your issues.
Writing also consists of understanding story format .
What that basically means is that your story must have a beginning, middle, and an end. Again, that may sound simple, but most writers do not develop these segments well. The beginning for example deals with the introduction of the characters, their personalities, and their dilemmas. This is when the tone of the book is set. The beginning of your book, usually the first two chapters, are your first opportunity to get the readers attention.