Choice is the only thing that makes our awareness useful. All kinds of shit effects my behavior. But I'm aware of that. I choose to take advantage of that awareness or not. I can't just pretend to not be conscious of my own ability to define myself, even if it is too complicated to explain or to ultimately know just what I'm defining myself within.
I figure I'm part of the universe, and the universe pretty much owns my ass; but I also have the human gift of being able define that universe in some small part while I try to define myself and gain further understanding. And that all comes down to choice. Not always in cut and dry measures, actually more often in a poetic sense that embraces and struggles against all the forces that might be acting upon me. Once you try to do away with complexity, and deny choices, then you're fucked.