Why does Anne need to give a brief sketch of her family? Does she treat ‘Kitty’ as an insider or an outsider?

Anne did not have a true friend with whom she could share her thoughts, personal feelings and experiences. She often felt depressed and alone. She thought that nobody would understand her musings and considered the need of giving a brief sketch of her family which comprised of an adorable father and mother, a kind grandmother and a caring elder sister. She named her diary ‘Kitty’, who became a true confidant and an insider to her.