We have no Freewill.
Because everything that exists is predetermined, therefor freewill is mathematically impossible. In fact, logically, as soon as something is limited by any construct or limitation (and 'existance' itself is a limitation) it has no freewill of its own because it will base every decision based on the predetermined constructs/limitations. So there is only an illusion of freewill. So basically we are all NPCs that think they are main characters.
It's the final pill to swallow.