She's hyper-conscious about her public image & how others perceive her. Looks wise, personality wise & acting wise. That's not how a confident person thinks or behaves. A confident person would be happy if others like him/her, but they will not change themselves to appease others. Their entire self-worth is not dependent on whether they are well liked - so they don't really care if some people don't like them. All this ties into her lack of comfort being in the public eye & in interviews and such. And the way she frequently interrupts others rudely during interviews, she lacks social grace which is something truly confident people possess.
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