CONFESSIONS OF A FUTURE SCOTSMAN
by PAUL REB
127 pages. Braziller. $5.95.
The American novelist narrating an identity crisis is getting to be the Ancient Mariner of fiction. It is a brave man (or somebody from out of town) who doesn't cross the street when he sees this wild, hoary figure loping at him with the sandwich board reading: "But who am Ireally?" Only a novelist who is intense enough or funny enough can continue to hold an audience with his glittering eye when he stabs a finger in the air and cries: "Once upon a...