Knowing what you don't want in life is almost as helpful as having a five year plan. Vision doesn't always mean you know exactly what you want to do or where you want to be in life; sometimes, vision is knowing where you don't want to be in order to find where you should end up!
So many people spend years (and money) studying to be doctors, lawyers, actors, dancers, business executives and scientists - when you're an author, you can be any of these things, and you don't need a degree or certificate; all you need is an imagination, a dream and an open mind.