What can a person really know for sure, except that one is the writer of the thing one is writing? When you type the words this writer, you are on solid ground for a moment, as solid as you can get in an artificial medium. Stray further, even by finishing the sentence, and you have strayed in the direction of fiction.
Over at Lit Hub, Rosalie Knecht ponders her life as both a writer and a social worker and meditates on the odd intersections where imagination creates fictional situations and fictional situations might follow into real life.