...another word for destiny or predestination would be determination.
Stuart Hameroff and Roger Penrose have developed the theory that quantum mechanical effects would produce such things as consciousness and free will, resulting in the book "The Emperor's New Mind" by Penrose. none of it has ever been proven, although it is very popular with many scientists and philosophers. i mean, of course, nobody likes to hear that we are robots, biological machines or that consciousness and free will are illusions, because the very definition of a human being, of ourselves is so closely connected to these concepts.
however, some subatomic particle or another has nothing to do with our observable reality. an apple is still an apple, and the sugar molecules in your jam will be reliably transformed into energy (or fat) inside your body.
are we destined - determined then? yes. but does that matter? no.
chaos theory (and mathematics in general) suggests that deterministic processes can be utterly unpredictable. even Laplace's classic "demon" - an intelligence imagined by him (about 200 years ago) who knows the position and trajectory of all the atoms in the universe and does therefore have unrestricted knowledge about all past and future events - is far from reality. how do you even get information from one end of the universe to the other (or to the demon), without wasting time about predicting the next event? and how can you possibly predict anything of this scale at all, when we can't even predict a coin toss? so even though we are determined, it is impossible to know what our "determination" will be. in fact, whatever you think can influence your life greatly - in good and bad ways. there is no substitute for staying open for opportunities and taking challenges and learning things. in other words, your destiny cannot fix what your misconceptions destroy.
"Darwin's Dangerous Idea" and "Freedom Evolves" Daniel Dennett
"The Feeling Of What Happens" and "Self Comes To Mind" Antonio Damasio
those are the best i know of about an evolutionary (Dennett) and neurological (Damasio) account of what is (and what is not) going on in the brain. you'll find many other books on free will and consciousness (e.g. "The Illusion Of Conscious Will" by Wegner or "The Ego-Tunnel" by Metzinger) and anything closely related to that ("Your Brain is Almost Perfect" by Montague and "On Intelligence" by Jeff Hawkins)
if you're still (or again) worried about destiny, read "The Seven Habits Of Highly Effective People" by Covey.
p.s. considering any "wave function collapse" stories: if you shoot a laser (concentrated beam of photons) at a car to measure its speed, nothing happens to the car. but if you shot a beam of photons at other tiny particles in order to measure them, the story is completely different. measurements of (the wave function of) tiny particles will necessarily influence (collapse) them and hence distort the actual measure - BUT that does not at all mean that we are able to influence those particles and their wave functions (including subsequent events) with the sole power of our minds. as Dennett puts it: "the whole point of indeterministic processes on a quantum level is that they are not determined by anything."
p.p.s. "what the bleep do we know" is an interesting movie, but full of pseudo-science. while Hameroff also appears in that movie, Emoto, the guy who says he can freeze water into nice or not so nice crystals with the power of his mind has been debunked by James Randi, who has been offering a prize since 1968 (raised in 1996 to one million US$) for anyone who could demonstrate any kind of paranormal, metaphysical or supernatural ability. there have been numerous other prizes by other institutions, none of which could ever be claimed.