I learned a long time ago to be grateful for what I had. I was taught well by parents who wanted me to be happy, and knew this secret well. Always be grateful, now matter how little, or how much you have.
I do know people who are unhappy- but have you ever noticed how those people seem to sap the happiness out of those around them? That their mood can change yours? I've noticed it, and find myself trying to stay away from that kind of person. It's easy to tell who they are-
The people that are happy? People want to be around them. So be thankful. Be Happy!