Many reject determinism because they feel that the outcome of a situation is caused by their choice. This is true. A person’s action is essential to the outcome of an event, but that doesn’t grant one any volition in the matter.
It is essential for an apple to fall before it can smash to pieces on the ground. We acknowledge no free will in this instance but completely agree all the factors were necessary for the exact outcome of the event. People—despite our cognitive abilities—are just a more complicated piece of matter in this show of cause and effect.
Instead of thinking of yourself as the author of your own life, think of yourself as the pen with the laws of nature being the author. You write your own actions, but you are within the system—not outside—and this means your thoughts and actions are essential to the outcome of events. It is not ultimately you that somehow makes these choices—that would mean you are somehow outside the system. The system as a whole is a responsible, with every factor being essential.
This leaves no room for free will. There is no instance in which one can claim to have authorship in a situation. You are presented with the facts, you go over them in your mind, and you react in the only way someone placed in your environment with your exact configuration of atoms could. There is one possible outcome, and that outcome is the choice you land upon.