I'm not sure Anne was really trying to tell us anything. She had no idea what the course of her diary would take; that is, she didn't write as someone who wanted everyone to know what she was enduring so they could learn something. Instead, I agree with the idea that she was simply in need of a friend or confidante in her very lonely and rather solitary world. This is relatively common, as teenagers--especially girls--feel the need to express themselves and find the best place to be honest and private. A diary is perfect for that. It's true that, as time passed, Anne understood more about her circumstances and offered us insights into the human condition. The Diary of Anne Frank, though, was one young girl's written journey through a difficult time, not a commentary on the atrocities of a world war.
I think that Anne's understanding behind keeping the diary was a way for her to be able to confide feelings, share emotions, and establish an unconditional emotional bond. Her excitement at the entries in the early going shows this desire. I do think that as the diary progresses, and the situation becomes more dire for Anne and her family, her perceptions become more astute and she becomes more aware that the diary gains a sense of personalized history. She seems to be aware that the longer her family is in hiding, the greater the danger. Her final perception about the nature of human beings (seen above) proves this and it stresses to us that she is becoming more aware of the world, herself, and her place in it. This might also serve as one reason why she is writing in the diary.
This is a diary of a young Jewish Girl in Holland who has to go into hiding during the Nazi take-over of her country. Eventually, they are found out and are taken away. Anne and her mother die in the concentration camps while her father survives. The person who owned the house found the diary and presented it to Anne's father after the war was over.
Anne was simply keeping the journal as a way to pass the time during their hiding as they couldn't not go about their daily routine of school, shopping, or social activities. During the day the families slept and kept quiet as the work was going on in the building offices below.
Anne is able to communicate her innermost thoughts in the diary. She has squabbles with her elder sister. She doesn't like some of the people with whom she is hiding. She hopes someone likes her. Anne is not very different because she keeps a journal, Anne is just like most other little girls, and we get to see inside her head because she has taken the trouble to keep a journal.
“It’s difficult in times like these; ideals, dreams and cherished hopes rise within us, only to be crushed by grim reality. It’s a wonder I haven’t abandoned all my ideals, they seem so absurd and impractical. Yet I cling to them because I believe, in spite of everything, that people are truly good at heart.”
Anne Frank, 21 July 1944