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 EugenidesDr. Armonson stitched up her wrist wounds. Withen 5 minutes of the transfusion he declared her out of danger. Chucking her under the chin, he said, "What are you doing here, honey? Your not even old enough to know how bad life gets." And it was then Cecelia gave orally what was to be her only form of suicide note, and a useless one at that, because she was going to live: "Obviously, Doctor," she said, "you've never been a 13 year old girl.
Jeffrey Eugenides