These traits are discussed below with proofs.
While writing about migraine, Didion reveals that she is, or at least she was in her young age, quite self-conscious. Like many young people, she was conscious of the image she presented of herself to other people. She did not want others to know that she suffered from migraine attacks, nor did she want to display the accompanying mood swings and irritation. So she lied when asked about any medical conditions like headaches. In the essay, this is apparent where she writes that while filling out forms for colleges or scholarships, or for any such matters, she would write that she "sometimes" had headaches in order to appear normal in public (The Bedford Reader 2005). With time, however, she outgrew this attitude, and learned to accept the frequent migraine attacks, and to be open about them (The Bedford Reader 2005).
Another personality trait that is obvious from the essay is the perfectionism that Didion possesses for her writing.