Okay /sci/, does free will exist or not? Are the movements and interactions of the smallest units that make up the universe predetermined, random or neither?

If it is random or predetermined then, since my body is inherently made up of these units, I am the one making the decisions am I not? I am made of those units and however they choose to move, through whatever force or lack thereof, is however my body and mind chooses to act. Therefore "free will" is real, even if the nature of the universe is random or predetermined. Is that correct or is it a brainlet take? Explain why.