Why does Millicent want to join the sorority

Millicent is a character of the short story entitled "Initiation" written by Slyvia Plath. In the beginning, Millicent was invited to join the sorority. Initially, she wanted to join the sorority in order to fit in or conform to the norm of the society. However, during the course of the initiation process she realized that she wanted to become true to herself than be involved in the sorority.