What is life if any than other than the dictates of our nature or jumbled mess of moments, places, people and events in the flux of time? Life for animals and plants is whatever is within the permissions of their rigid nature, or the nature of the physical universe, and life for human beings is in the questioning, in thinking critically, and in the subsequent pain or joy that the mind induces. The question of free will is as old as the mankind itself, as long as our consciousness can peer into things, into itself reflecting.
What is the proof that we are not being driven along the preset paths towards preordained destinations beyond life and death?
There is none, apart from the fact that whatever happens to us, we can observe, and thereupon think, and wonder, and then feel about our destiny, or about the absence of it. Now, the absence of destiny is the matter of the presence of an absolute Will, but whose will?
If life is not our will, but the Will of God, then do we not sin against Him?
And if life is our will then do we not feel pain, hurt, sorrow, dejection and failure?
In either case there is possibility of more than one being in existence: Either one is the super-projection of general nature of things, a you mentioned, or human life is the emanation from the Will of God itself, this is to be known certainly that we have free will, and that to match our human capacities, if not the absolute capacities of God Almighty, or those of the nature of the universe.