I saw the quote many times and finally found the original one.
“(If you want to really hurt you parents, and you don’t have the nerve to be gay, the least you can do is) go into the arts. I’m not kidding. The arts are not a way to make a living. They are a very human way of making life more bearable. Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven’s sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something.”
– Kurt Vonnegut, A Man Without a Country.