Basically you come up with the fictional idea and you start writing that story, but then in order to write it and to make it seem real, you sometimes put your own memories in. Even if it's a character that's very different from you.
Jeffrey EugenidesI hadn't gotten old enough yet to realize that living sends a person not into the future but back into the past, to childhood and before birth, finally, to commune with the dead. You get older, you puff on the stairs, you enter the body of your father. From there it's only a quick jump to your grandparents, and then before you know it you're time traveling. In this life we grow backwards.
Jeffrey Eugenides