I feel like either this has been discussed lots of times since it's a common, good question, or never since people had thought it unoriginal because of that.
Our brains make the decisions. Our brains are not exempt from physics, so I'm pretty certain it doesn't exist.
"Pretty certain" because the 'philosophy' if I can call it that, relies on the uncertainty that how we see things is how they are(Is "pretty certain" too certain?).
Sorry if I've basically just said "Water is wet. Do you agree?". I was not going to post because I was quite confident on my opinion, and due to lack of experience thought that by extension my 'opinion' was really just a fact that everyone believed. But more recently I realised said train of thought is unwise.