"I’ve seen what you can get, and we still don’t have many of the things. So, we need to work harder. Then, I’m sure, one day we will get there." - That's the sp

"I’ve seen what you can get, and we still don’t have many of the things. So, we need to work harder. Then, I’m sure, one day we will get there." - That's the spirit! The only reason why they're not happy is that they make the (very common) mistake of delaying the happiness until the end result. With so much to learn and so much to achieve in this world, that end result never comes, that's why we need to learn to enjoy the process of getting there itself. Enjoy the road, not the destination! Look back at what you've achieved - be proud! Look at what others have achieved - be happy for them! Set your eyes on the next thing you want and go ahead and try to get it - that's the best way to be happy, even in a first world country (that sounds weird :-)).