Art is a way of emphasising your existence. Your perspective.
What is special about your own perspective? What can it offer that hasn’t been provided elsewhere? Perhaps nothing. But then, isn’t another purpose of art to spark kinship?
John Reed has a wonderful explanation of a writer’s audience. Obviously, there will be many who disagree with whatever opinion you express. Yet everyone can find friends if they are thrown in with a large group of people. At school, near everyone eventually coalesces into groups of people with shared qualities. Those few people you can always find in a broad group, who would have become your friends had you been pitched in with them. You think on the same wavelength as them. It is those people you are writing for. In your school they may number less than the digits on one hand. In the outer world they are in the millions.