Why can’t the human body just switch itself off?

Why can’t the human body just switch itself off? Especially if you’re suffering and we’re tired of life

I suffer from so many medical conditions! Everyday. I have to get treatment for my crohns soon and get so many vaccinations before it. I’m in pain everyday!

I also am alone, all i got is my dad. And the rest of my family is estranged. My mom is dead, my grandparents are dead. No close friends or family. No partner. And I won’t be able to find anyone anyway
Why can’t the human body just switch itself off?
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