Borrowing trouble is not normal
What brought this up? Someone told my daughter that she cried for hours when thinking about the fact that her old dog will soon die. Such a maudlin view is the very antithesis of the Rashi above. You see, the Torah assumes that people do not dwell on the fact that, yes, all mortal beings will die at some point but live in the present and celebrate the joy each moment brings even when they know that life is transient.