The misapprehension about gender performativity is this:

“The misapprehension about gender performativity is this: that gender is a choice, or that gender is a role, or that gender is a construction that one puts on, as one puts on clothes in the morning, that there is a 'one' who is prior to this gender, a one who goes to the wardrobe of gender and decides with deliberation which gender it will be today.”

― Judith Butler, Bodies That Matter: On the Discursive Limits of "Sex"