I really like your point of view! I think you are being truly open-minded when defining what a comfort zone actually is. Pushing yourself to do things doesn’t mean taking innaproppiate risks, going blindly into an unknown direction. I feel that waking up and saying “I really want to quit this job”, or “*doing something* doesn’t feel so good anymore” means one is actually creating a comfort-zone of his/her own. A place to do as you think is better for you, always counting with the loving support of those around you.
Oh, and of course, if ever you should fail, that zone is not only comfortable to take a first leap, but to maybe lay back for a bit, reorganise your thoughts, and jump again.