Insofar as you live in a world, you cannot escape forming a persona. You can say, "I won't have such and such a persona," but as you discard one you get anotherunless, of course, you live on Everest. You can only learn who you are through your effects on other people. By this means you create your personality.
— C.G. Jung
Jung is not describing a problem to be solved. The persona is not a mask to be stripped away to reveal the authentic self beneath — that framing, which runs through so much popular psychology, is itself a persona, the persona of sincerity. What Jung is pointing at is more constrained and more honest: selfhood is not prior to the social world, waiting to be uncovered. It is produced in the friction between your intentions and what others return to you.
This is uncomfortable because it locates something constitutive of personality outside your control. You discover who you are not by introspection but by watching how you land — which means the self is always, to some degree, a finding rather than a possession. The impulse to refuse all persona, to live beyond the mediation of other people's responses, is not liberation; it is Everest, and Everest is barren. The soul does not form in isolation. It forms in the specific resistance that other people offer, the ways they receive you partially, misread you, surprise you with what they reflect back. That resistance is not an obstacle to knowing yourself. It is the knowing.
C.G. Jung·Analytical Psychology: Notes of the Seminar Given in 1925·1989