I believe in free will; predestination may also be true, I don't know, but I don't think the two are mutually exclusive.  If I choose to act in a certain way because that is who I am, then that is free will.  But, if there is some metaphorical slab of stone out in the Universe upon which the fate of everything is written, what's the difference?  I'm not conscious of any part of me that is crying out at my body to act differently (aside from my conscience, at times), so, still assuming predestination is correct, I appear to be in agreement with destiny.  If we wanted to have truly free will, that would mean that we all are wild cards, with no fixed identity, which I don't believe.  The end result is the same: I do what I want.  Perhaps the slab of stone is attempting to take credit, but that doesn't really effect anything.