Characters
I'm not the sort of woman men marry.
— The Second Mrs. de Winter • Rebecca

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker places herself outside the category of women she believes men choose to marry. The statement presents that exclusion as a settled pattern, rather than a single rejection. It can sound resigned, but the judgement concerns how men choose partners, not an established measure of her worth.
Context reviewed