Entropy gives us the arrow of time, which in that form has existed since the birth of the universe. From order to chaos. At some point the process might reverse and the universe begin to contract, at which point one would assume that the arrow of time would point in the opposite direction, from chaos to order.
If that is the case then one could infer that we have indeed got a "fate" as part of the universe and our past and future do already exist.
I might be waffling and if I am, its because my small brain aches when I try and think about these things.