The key to live a happy life is being thankful to our creator.

He says "Be grateful to me for what you have, I'll increase it more".

Never be ungrateful and don't complain to the God. You don't deserve to have things ths you have already. Trust me!  Just look around you. Things in your possession were not supposed to be with you but still they are. 

There was a story of two men, one says to other that
"where were we when the God was giving away money?"

The second man says
"where were we when the GOD was giving away pain?"

So we should be glad and very grateful with what we are having right now before the blessing are snatched from us.