I very often ask myself this question, and a couple of days ago, I clearly answered it for myself. I am very satisfied with my life. I've always wanted to be able to afford everything my parents couldn't give me when I was growing up. And I recently bought myself a PSP 3000 . I was insanely happy at that moment. Even though I had already bought an apartment and a car and was earning very well. But it was just a little thing like that that made me feel happy.