A few years ago, my wife and I were watching the movie, "Nim's Island." In the movie, Jodie Foster's character is constantly being pestered by one of her characters. My wife asked if my characters ever talked to me that way. I replied, "Sometimes, the biggest problem is getting them to shut up."
I guess it goes with the territory. I figured out long ago, if our characters don't seem real to us, they will never seem real to our readers. If they aren't real enough to us that we care about them, and feel their joys, their sorrows, their pains, etc., the readers won't care enough, and won't feel those things, either, and they'll put aside our stories in favor of ones that have characters they do care about.
If you haven't read it yet, I highly recommend the book, "Sometimes the Magic Works: Lessons From a Writing Life," by Terry Brooks. Excellent insights into the life of a writer.