A false sense of self. A deceptive persona you put on for the sake of others. Putting on a show or pretending to be something you are not. Someone is bluffing or lying. A situation where you are posing as someone that you are not. A part of you that is trying to escape from the truth and making yourself feel better by living a lie.
See Masquerade, Mask, Performance, Fake, Façade, Ego, Hide, Halloween, Make-up.