It's a fairytale. Destiny is a thing people made up through stories and folklore because it makes people feel better about the way their lives are headed. Better to think you've gotten where you are because some unseen hand of God manipulated the strings than that you forged that life for yourself.
But you do. You forge your life with your decisions, every day. Even when life throws you a curveball you weren't expecting, you still have the choice of how to respond to it.