If it's worth saying, but not worth its own post, then it goes here.
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That's why I am asking here. What goal should I have? I use goal and preference interchangeably. I'm also not expecting the goal/preference to change in my lifetime, or multiple lifetimes either.
First, goals, multiple. Second, internally generated (for obvious reasons). Rationality might help you with keeping your goals more or less coherent, but it will not help you create them -- just like Bayes will not help you generate the hypotheses.
Oh, and you should definitely expect your goals and preferences to change with time.