here's a thought...
You know how the universe is expanding at 800 mile per second or whatever... that's predetermined, right? Determined by whatever caused it.
The way the planets and rocks rotate around each of those stars.... pre-determined by the original energy that started it all.
The way water forms, life evolves, rocks fall from the sky onto earth... that's all controlled by the original energy that caused the Big bang.
The way ants and lions act... all controlled by the set of circumstances and events from the big bang, which was caused by energy.
Why would people be any different? Why wouldn't we be like every other lion, ant, waterfall, meteor, moon, planet, star, and galaxy... controlled by nothing but outside events predetermined by the original energy?
If you think you have free will, that's because the original energy gave you that perception. Did you choose to be born? will you choose to get cancer of the ass one day? Did you choose your parents, or the water and air around you?
What have you chosen? the way you interact with the people and esources around you (which incidentcally were given to you by chance, by the original energy)?
To me, if all the bigger events in the universe were predetermind by a bigger energy, then you and I sure were too.