Maybe we suffer to be able to write as you did. It's nearly a poem.
But those question you ask can't be answered. Not yet anyway, not by you or anybody else who is stuck n this world. Maybe one day we will get the answer.
As others pointed out: Go on, survive. Happiness may be the more intense after some time of suffering.
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Deep into that darkness peering, long I stood there wondering, fearing,
Doubting, dreaming dreams no mortal ever dared to dream before (E.A.Poe)