When Anne Frank first begins writing her diary, she is a typical young teenager who wants all of the attention she can get. She has big plans for becoming an actress or a singer or anything that takes place on stage, where she can be seen and admired by everyone.
As the book progresses, though, Anne becomes less carefree. After months (and then years) of days filled with not much else besides time to sit in quiet contemplation, she begins to rethink what is important to her. She begins to wonder if maybe her earlier dreams were somewhat selfish and she starts to think more about others instead of just herself. Writing in her diary inspires her to write other things, as she mentions often.
A few weeks ago I started writing a story, something I made up from beginning to end, and I've enjoyed it so much that the products of my pen are piling up.
She reads the stories she writes to the others hiding with her in the annex and she begins to wonder if the voice this writing gives her would be useful in spreading the word about what has happened (and is happening) to her and the other Jewish people in Europe. The older she gets, the more she wants to be a writer and the more she wants to change the world, not by showing off on stage, but by making people think with her written words.