I don't understand all the hostility towards compatibilism in the comments. To me, asking whether we have free will or everything is predetermined is a false dichotomy, like asking if our muscles are made of fibers or made of atoms. These are just two models of reality, and they are compatible, hence the name.

Compatibilism is simple: Determinism seems true. When I say I "can" decide to stand up and go eat a bar of chocolate, then, all that means that it's a future that appears accessible to me, that perhaps I have an action plan that I think would reach it if taken, a plan I also "can" deliberate upon, accept or reject - what else could it possibly mean? There might be a single future, or a randomly chosen future not under our control - either way we don't have access to knowledge of it. I don't know in advance what I will do, and interact with people who don't, either, all the time. Clearly we're used to doing reasoning under uncertainty and mentally working with counterfactuals. "Can" is a word that works in that context, we regularly use it to reason correctly and make correct predictions about ourselves and others; it must refer to how our decision processes interact with the world/the future, and not some kind of incoherent libertarian free will.