This is what it means to be an artist. You see the world a certain way. You try to capture and express what you see. You create. You do so because it is who you are. And then comes the question of whether, with whom, and how to share what you create.
There are artists who believe their creative work is meant only for them, it is a private endeavor. Sometimes they're right. But sometimes, as in the case of Vivian Maier, and many another great posthumously discovered creative artist (and yes, I include writers as artists), they're wrong. They have failed to see that they are creating something that speaks to other members of the human race so eloquently that it must be shared.
We human beings are engaged in a millenia-old struggle to understand ourselves and our world, to make sense of it. This struggle builds and grows and bears fruit through conversation, through discourse. That discourse happens not merely in the present and face to face through talking, but mind to mind and soul to soul across time and space through art, through the written and spoken word, through music, through scientific discovery, through inventions and engineering and architecture. You could say that the meaning of life is to participate in this conversation, to contribute to the expression and exploration of life and the world and the human journey.
There's a reason we humans have a drive to understand, to create, to give expression to our experience. That struggle to understand, the effort to explore and capture and express, is worth it because it's why we're here. It will never be complete, but it is a beautiful, magnificent, holy, eternal work-in--progress.