Appreciate what you have

I've been touched by the very underprivilege peoples who always try hard to make it in life and yet others who have it all doesn't see the value of life, Why is that? peoples tend to complaiin about everything for instance students who can't go to varsity because they dont have a new pair of sneakers that will make them look cool to thei r friends while he clearly knows he cant afford them.........please help me find answers and understands life in a different way.