I can't remember a time when I didn't want to be an actor. It has just always been an inevitability on some level.
Believe in love. Believe in magic. Hell, believe in Santa Clause. Believe in others. Believe in yourself. Believe in your dreams. If you don't, who will?
I think it's a little simplistic to explain a work through the psychology of its author. In other words, that Haneke has emotional problems, so I don't have to take his films seriously. By using this argument, the viewer retreats from the challenges of the film.