aaah hi there!! C:
to be honest i dont think anyones really self taught. we all learn to draw by looking at things, watching cartoons and watching others draw. what we see influences how we perceive art, and in this way a tv show could teach you how to draw as much as an art teacher or a special class could.
but to answer your question, the only actual art classes ive taken are the ones offered at my public school and to be honest those dont teach you very much about the things you really need to improve on as an artist