First of all, go see a therapist. This could be a warning sign of depression or some underlying mental illness. I'm not being over-reactive, this was the first stage for me in what is a long struggle with these kind of questions that accompany a lot of mental fatigue.
The second bit of advice that I would have is to realize that every second you have on this earth is a gift. Not even in a religious sense, but a general spiritual sense that you are here and that every second you spend with the people you love is a miracle in itself.
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