We are all finite beings, so “rational” must be finite approximation of rational, so although there is a question about how far to apply systematic rationality to your thinking, that is itself not a question fully answerable by systematic rationality (although you could do a finite approximation of such an answer). Whether or not your thinking is rational here is not at stake so much as asking how much effort do you want to expend on coming up with an answer and what things you are willing to consider as evidence (counterfactual selves, for example) and how you will weigh them.
We are all finite beings, so “rational” must be finite approximation of rational, so although there is a question about how far to apply systematic rationality to your thinking, that is itself not a question fully answerable by systematic rationality (although you could do a finite approximation of such an answer). Whether or not your thinking is rational here is not at stake so much as asking how much effort do you want to expend on coming up with an answer and what things you are willing to consider as evidence (counterfactual selves, for example) and how you will weigh them.