Director, what you are trying to say wouldn't tie in with destiny, but more whether on not we have free will (if i understood what you said correctly, if not, just say). Free will is something of an odd thing, do we actually make our own choices, or is it pre-determined and we just think we are making a choice. Multi-verse would answer this question. If we somehow managed to get a universe the exact same as ours, we could have the same event happen in both universes, lest say a man goes to eat out. If he orders the same thing in both universes, then free will is is non-existent, but if he orders something different, then free will exists.
Now science, btw this is all from memory, so if i'm wrong i'll gladly change. They think there are other universes out there because of the behavior of atoms, they are constantly vibrating and we cannot pinpoint an atoms location, which is strange. So they think that these atoms are actually involved with other dimensions or universes. String theory is all about this if you actually want some fact, cause i'm an idiot and this is all probably wrong.