Why is pain part of our human experience?

Prayer in Times of Suffering or Weakness (BOCP)
Dear Lord and Savior Jesus Christ: I hold up all my weakness to your strength, my failure to your faithfulness, my sinfulness to your perfection, my loneliness to your compassion, my little pains to your great agony on the Cross. I pray that you will cleanse me, strengthen me, guide me, so that in all ways my life may be lived as you would have it lived, without cowardice and for you alone. Show me how to live in true humility, true remorse, and true love. Amen.

Psalms 13:1-6 NLT - O LORD, how long will you forget me? Forever? How long will you look the other way? How long must I struggle with anguish in my soul, with sorrow in my heart every day? How long will my enemy have the upper hand? Turn and answer me, O LORD my God! Restore the sparkle to my eyes, or I will die. Don’t let my enemies gloat, saying, “We have defeated him!” Don’t let them rejoice at my downfall. But I trust in your unfailing love. I will rejoice because you have rescued me. I will sing to the LORD because he is good to me. Our meditation on pain and suffering would be completely shallow if we didn’t consider the pain and suffering of Jesus.