everything that's gonna happen in the universe, since the big bang, is already going to happen
like, if you roll a marble on the floor, and nobody does anything to mess with it, it's gonna go where it's gonna go. even if there was also another marble rolling about, and they hit each other, that one, too, had a certain path, and the marbles colliding was part of their paths
same thing for all the planets and asteroids and stars in the universe, even with all their collisions and all the times that the gravity of another affects them, they all were going to do exactly what they did, right from the start
and everything that livings things do is based on their experiences and their ancestors'
every decision you make is made based on a combination of the instincts your species has gained through evolution and the things that have happened to you during your life
the experiences you have primarily come from other people, who made the decisions that led to those experiences, based on their experiences
and in the very beginning of life, the only experiences that any living organism had were those caused by the movement of inanimate objects, which, like I said in the first part of this post, already had their paths determined
so how can we really have free will