Well I'm 3 chapters and 12000 words into my book and I still haven't decided on an main antagonist. I was thinking about having my character's past experience with people affecting his decision making in his present be the antagonist but It seemed a little too non antagonizing. I also considered having maybe one of those characters from his past come in and be the main antagonist but not sure how I can relate that to what my story is currently shaping into. What do you guys think about just having one's past experiences be the antagonist? Plus when do you think is a good time to introduce it as the clear problem of the story?