self-denigration

noun

self-den·​i·​gra·​tion ˌself-ˌde-ni-ˈgrā-shən 

plural self-denigrations

: disparagement or belittlement of oneself

… survived adolescent mockery to become a talented American comic novelist whose angst and self-denigration propel his writing.

—Jenny Shank

Word History

First Known Use

1961, in the meaning defined above