"In fact, I thought my calling was to be a painter"

Patti Smith's quote suggests that she felt a strong sense of function in her life, which purpose was to be a painter. This might suggest that she felt a strong connection to the art kind, and that it was her destiny to pursue it. It could also imply that she felt a strong sense of responsibility to use her skills to create something significant and gorgeous. It might also be translated as a sign of her aspiration and determination to make something of herself. Whatever the case, it is clear that Smith felt a strong connection to painting and that it was her calling in life.