Quantum mechanic's effect on my thought processes are inherently unpredictable, therefore I have free will.
Are you sure? Are you sure it's not just random, as quantum mechanics is? Predictability isn't really necessarily related to free will. After all, decisions can be made from randomness. Imagine using dice and a table to decide outcomes of questions.
Whether you believe our actions are controlled by classical or quantum mechanical physics, at no point does a magical decider from outside of randomness or determinism factor in.
For free will to exist (due to quantum mechanics at least),
you, that is, the part of you that makes decisions, would ultimately have to
be physics. Your consciousness or whatever would have to influence probability distributions of quantum mechanics to cause different neuronal pathways to fire. While it's probably not strictly possible to prove that isn't the case, it's hard to imagine that it is.
Alternatively, if you knew everything about someone's personality, you could 'calculafe' their decisions too. Knowing the position and state of every atom in their body at the decision point achieves the same thing but is far more difficult. Being able to predict someone's behavior does not mean they have no free will.
Depends on what you mean by free will, but you can imagine from a philosophical point of view at least that if your future is entirely certain then free will either doesn't exist or is meaningless if it does.
To put it another way, we
do make decisions based on history and current observations. It's just that our decisions are always strictly dependent on those things, which are outside of our control, and thus our decisions are strictly outside of our control. If we make decisions based on something other than what we have and are experiencing, what is it?
And in case, it's easier and healthier to act as if I do have free will, so I do.
While I don't believe in free will, I do believe this is the healthy mindset. For all intents and purposes, whether we have free will or not is irrelevant outside of philosophical discussion.