Fate V Free Will

I think that in today's world, not in the world of Minority Report or in the world of Oedipus, it is impossible for any of us to know if we have free will or everything we do is just leading to a predestined fate. In Minority Report, John Anderton knows positively that he acted by his own free will in not originally killing Leo Crowe because he knew his original fate predicted by the Precogs. In the movie, anyone who doesn't know their fate believes their actions are free will when, in reality, they are predestined.  This shows that it is only possible to know that you are acting under free will if you know what your fate is supposed to be. I believed that the decision to take Lit Film as a class was a decision I made by my own free will but how could I know if that decision wasn't made by me but it was actually part of destiny, a decision that will lead me to my ultimate fate. In the case of Oedipus, the answer to the question is presented a little differently. In this case, it doesn't matter if you know your fate or not, or if you think you are acting by your own free will or not, because you will ultimately achieve your destiny no matter how hard you try to escape it.  However, I believe the real world to be much more like Minority Report however with todays technology we are unable to see our fate so we as people are incapable of knowing if anything we do is fate or free will.