Why It’s So Hard for Some of Us/The Story We Tell About Our Lives

Why is it that some of us who have been blessed with so much in life still find living so difficult? 
Rebecca and her friend Amy mused at this perplexing phenomenon as they commiserated on how challenging life had always seemed to be for them—especially in contrast to people like Jenny, Rebecca’s twin (also good friends with Amy) who seemed to be naturally more positive and emotionally buoyant.