I believe that we are all prepared for life differently. Everyone had those parts in their lives that taught them something: Loss, pain, disappointment, death and sadness.
Loss taught us to believe that people are temporary. Pain taught us to appreciate the good moments more. Dissappointment made us lower our expectations. Death made us use every moment we have with the people we love while they're still here. And sadness made us believe that after each sad phase there is happiness waiting for us.