Full Idea
Suppose somewhere deep in the rain forest is a book that includes a story about you as a truck-driver. I doubt that you would be inclined the think that that story, that book, is the reason you could have been a truck driver.
Gist of Idea
If some book described a possibe life for you, that isn't what makes such a life possible
Source
Jonathan D. Jacobs (A Powers Theory of Modality [2010], §3)
Book Reference
-: 'Philosophical Studies' [-], p.7
A Reaction
This begins to look like a totally overwhelming and obvious reason why possible worlds (especially as stories) don't give a good metaphysical account of possibility. They provide a semantic structure for modal reasoning, but that is entirely different.