Writing beyond pages of a book or a fiction story

Ever read a book and hated the ending? and then wishing to change it? or perhaps go through a phase of hating the author for writing such an ending?
I think generally writers love the idea that they are in control of whatever they write. sometimes they forgot too that they dont really write their own life story. its god who does it, if u really believe in one. fate if u dont agree to god. atheist call it choice.

I too was lost as the writer.