this is hard to give real concrete data on but i'll try, bad nutrition/hunger can lead to irritability leading me to beleive its not 100% a choice, but simply eating a snickers won't completely change how you do things so that leads me to beleive its not 100% chemical either, its a weird mix of the two

Neither of those options imply randomness. Human behavior is certainly not random, this is beyond obvious (or else we'd behave in all sorts of incomprehensible, sporadic ways).

If you're asking whether we can will our behavior, compatibilism is the most coherent theory in my opinion: http://plato.stanford.edu/entries/compatibilism/

I believe that every action, including our thoughts, was determined by the Big Bang.

i say everything you do and will do was set into motion long before you had a say in it

free will is a joke