Write two sides of anne's personality,why did she call herself "little bundle of contradictions"?

By now Ann is self-aware enough to understand her own logic and was of thinking. She knows that her adolescent mind is full of contradictions, emotions, and passions. Just before her family is betrayed and sent away to the camps, Anne writes:    

I'm split in two. One side contains my exuberant cheerfulness, my flippancy, my joy in life and, above all, my ability to appreciate the lighter side of things.... This side of me is usually lying in wait to ambush the other one, which is much purer, deeper and finer. No one knows Anne's better side, and that's why most people can't stand me.

 Anne understands the differences in herself as a little girl and as a near adult. Her harsh and unfair realities are putting her thoughts, as a girl coming of age, into context.