Oh, no! How horrifying! Except of course there is a “you”; the fact that “you” emerge from the interaction between physical elements, which are all hard determined, changes nothing about that.
Anyways, presumably your consciousness isn’t free - the processes that make it arise cost your body energy to regulate and execute. So, decision making with a consciousness likely offers some kind of evolutionary advantage, whether as a property of consciousness itself or because when you do X, Y, and Z which are useful themselved consciousness arises.