Life and people are complex. A writer as an artist doesn't have the personality of a politician. We don't see the world that simply.
To be true to life, a novel must have an ending that is inevitable given the specific personalities of the characters involved. The novelist must not impose an ending upon them.
The historical Woodrow Wilson suffered from numerous complaints which we might today label as psychosomatic. Yet, Wilson did have a stroke as a relatively young man of 39 and seemed always to be ill. He was 'high-strung' - intensely neurotic - yet a charismatic personality nonetheless.
What you call your personality, you know? --it's not like actual bones, or teeth, something solid. It's more like a flame. A flame can be upright, and a flame can flicker in the wind, a flame can be extinguished so there's no sign of it, like it had never been.
It's hard to say how we compare to other people. We each inhabit our own personalities. I have often felt that I'm a very neutral being and that I have almost no personality. I'm drawn to writing partly because I'm fascinated by the mimetic process.
I don't know whether I am different from other people. Perhaps I am. Perhaps no one has a personality, and people are inventing themselves in the context in which they find themselves.
Long ago I'd said that I am "fascinated by the phantasmagoria of human personality" - this is perhaps even truer now than years ago.
Shakespeare would seem to have been a person for whom the human voice/personality in all its splendid idiosyncrasy was absolutely enthralling.