This is very true. I touched on a vaguely similar topic recently. I think some of the issue is that we live in a society that tries to make us feel bad about feeling good and that extends to feeling good about the self too. Everyone tells us that we should be afraid of the future or that we aren't good enough to survive in it and that keeps us slaving away and not being content with who we are and what we have.

It doesn't take much to move past that though. We just have to believe that we are worth our own appreciation and that we deserve to feel well.