Don't buy this 'believe in yourself' rubbish. Why do they...

Don't buy this 'believe in yourself' rubbish. Why do they keep telling youngsters that? There's no point believing in yourself if you don't know what you're doing. Once you've got a vision of what you want to do, by all means stick to that passionately and doggedly. Believe in your ideas. It's not quite the same thing.