I for one one believe we don't. By large act unconsciously going throughout our day carrying out a wide variety of complex tasks without thinking the slightest. Take the complexities of speech and think what really goes into social interaction. However we have this illusion of free will from our conscious experience, we aware therefore we think we control, but given my example above, how much do you really control? See it's an illusion.
I think of ourselves as unconscious automata - reactionary creatures responding to external stimuli. Our self awareness gives us an illusion of free will.