I've always enjoyed the thought that there are multiple universes, and there are two opposing forces at play. Chaos causes the universes to drift over time. Another stabilizing force tends to bring them back together in the most efficient way possible. This stabilizing force is felt by us as experiences of fate, or a sense (or lack) of belonging. It's not that there's a preordained destiny, but a consensus among universes that you are either in or out of.