Why do we have to keep up with the neighbors?

What is that all about anyway? Why do we feel we have a right for what the neighbor worked hard to get? I have someone in my life for an example if I get a haircutt or buy something new they are right behind me doing the same. Why can't we be happy with who God made us? Why do we have to have something different than what God has blessed us with? I know I have done this especially living where I do... It is hard to be thankful, but we need to be because we do not deserve it...