Sick soul. Suicide in is unnatural. A flame doesn't seek to put itself out nor does the dirt body seek to kill itself. You are right that your dirt body and its life is essentially worthless. The sadness isn't in your dirt body any more than sadness is in your smartphone. So pray to God and know that your soul isn't also worthless because if it was worthless he'd destroy you immediately. Worthless souls do not get to speak to the almighty creator of everything, at least not for long. It would be violent and quick, and I doubt you'd feel it. So next time you feel like this, pray and see how it goes. Spoiler: he loves you.