Is it a myth that Artists are CraZy?Yes, it is a myth. Creative people may not be mainstream but that doesn't mean they are crazy.
Picasso painted images that might have looked crazy but he had a strong grip on reality. Picasso had a tumultuous love life and he seemed to think that his lovers were crazy as this painting suggests:
Yet, in spite of most artists being sane, there are artists who seem to have had genuine mental issues:
Vincent Van Gogh killed himself at the age of 37 and suffered from some unknown ailment throughout his life. He may have been bipolar or an addict but in reality, we do not know. This self portrait was created after Vincent chopped off his ear.
Van Gogh's ear
Edvard Munch suffered from a variety of emotional issues, depression and hallucinations. Mental illness ran in his family. He credited his mental illness for the creation of his most famous work, "The Scream".
Munch's famous painting
Francisco Goya at the age of 46 came down with a mysterious mental illness that affected his painting style. This painting came after his breakdown.
Georgia O'Keefe was hospitalized for depression and anxiety at the age of 46. However, I'm not sure she was crazy. This was a time when Georgia was living with a bossy, old man (Alfred Stieglitz) who also cheated on her. After he died and she moved to New Mexico, she thrived and her art blossomed. Stieglitz who was a photographer, he created a beautiful series of photos of O'Keefe though the years of their relationship.
Alice Neel, like Georgia O'Keefe, went through a rough patch. After an early marriage, Neel lost a young child to diphtheria. Shortly after she had another child and her husband who was Cuban left Alice and took their daughter to live with his family in Cuba. Alice was unable to get her daughter back and her relationship with both husband and child ended. After that, she was admitted to a psychiatric hospital for a nervous breakdown. Her life was filled with more relationship drama. She went on to have two sons by different fathers and managed to support them as a single mother on welfare and painter in the government program, WPA which employed artists during the depression. Bohemian? Yes. Crazy? Probably not. In the 1960's her years of success and fame began.