Double personality...some said that everyone have it..is it true??or not??

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once i read that every people have double personality, for hiding their fear, or maybe their weakness...I don't know, for me, once i have this character that don't care and fearless, that's what my friend said about everything, idon't know if that was double personality, but i admit, i feel save whetever i'm that character, maybe it's right...everybody have double personality, what do you think friend? is it true or not?