self-abasement
(ˌsɛlfəˈbeɪsmənt) noun the act of putting oneself down, behaving in a very humble manner, or belittling oneself ■ Submission or self-abasement is another tactic of emotional manipulation. ■ people wallowing in self-hatred and self-abasement ■ They believe self-abasement will win them back whatever it is they have lost.