The substitution of pseudo acts for original acts of thinking, feeling, and willing, leads eventually to the replacement of the original self by a pseudo self. The original self is the self which is the originator of mental activities. The pseudo self is only an agent who actually represents the role a person is supposed to play but who does so under the name of the self.
It is true that a person can play many roles and subjectively be convinced that he is "he" in each role. Actually he is in all these roles what he believes he is expected to be, and for many people, if not most, the original self is completely suffocated by the pseudo self. Sometimes in a dream, in fantasies, or when a perosn is drunk, some of the original self may appear, feelings and thoughts which the person has not experienced for years. Often they are bad ones which he has repressed because he is afraid or ashamed of them. Sometimes, however, they are very best things in him, which he has repressed because of his fear of being ridiculed or attacked for having such feelings.
The loss of the self and its substitution by a pseudo self leave the individual in an intense state of insecurity. He is obsessed by doubt since, being essentially a reflex of other people's expectation of him, he has in a measure lost his identity. In order to overcome the panic resulting from such loss of identity, he is compelled to conform, to seek his identity by continuous approval and recognition by others. Since he does not know who he is, at least the others will know - if he acts according to their expectation; if they know, he will know too, if he only takes their word for it.
The automatization of the individual in modern society has increased the helplessness and insecurity of the average individual. Thus, he is ready to submit to new authorities which offer him security and relief from doubt.
excerpt from: Erich Fromm (1941) Escape from Freedom.pdf: Pseudo Self