There is the old catch-22 line that a mentally unstable person can't know, as per their illness, that they are unstable. But that was wrong. You can and do have the insight to see your own crazy.
Harlan CobenLet me back up a little and tell you why I prefer writing to real life: You can rewrite. A novel, for example, can be cleaned up, altered, trimmed, improved. Life, on the other hand, is one big messy rough draft.
Harlan Coben