We might, but that doesn't mean she does. Yukari keeps comparing herself to the others, most of whom are 'human' as she calls them- people who've lived longer lives, had more experiences, have a much more established sense of self and history. She's just an organic construct made for war, and, after attempting to emulate 'humanity' as she sees it, she has found she's no longer capable of either.
This breakdown is coming because, I believe, she hasn't fully realized her own self, and hasn't discovered that she's had plenty of history and that is affecting her sense of self.
She's visualizing herself failing, and that's making her actually fail.