If we take an objective view based on science, from what we know so far, there are immutable physical laws governing the universe, and from the world of quantum physics, we have what, as far as we can tell, is complete randomness; no pattern has been observed. This would suggest that the universe is predetermined and/or free will is an illusion.
In practice, though, consciousness definitely makes it feel like we have free will. I can make what feels like a conscious decision.
Ultimately, though, my current assumption, until I see evidence otherwise, is that everyone’s path in this world is “predetermined” as much as true random influence is predetermined. The universe takes only one path.
How does this affect my other beliefs? Well, it doesn’t mean that people shouldn’t, say, be punished for breaking laws. The point of punishments is to discourage people from breaking the laws, not the punishment itself. The disbelief in free will, however, does make me more sympathetic to other people, even if they have done bad things. While they had the thoughts of making a conscious decision to commit a crime, they are still essentially along for the ride and those thoughts are just sensations like anything else they experience.