Word Origin & History
self-conscious
1688, "aware of one's action," a word of the Eng. Enlightenment (Locke was using it by 1690), from self + conscious (q.v.). Morbid sense of "preoccupied with one's own personality" is attested from 1834 (in J.S. Mill).
[self-kon-shuh
s, self-] 