If you don't feel that way it's time to change that or figure out why that is.
Tonight I ran across this blog and was digging deep into her posts because the more I read the more I seemed to connect with her. Anyway she had this lovely post where she records a meditation that you can follow along with about gratitude. I can say it really made me feel like even though not everything I imagine my life being has happened yet I still am happy for what I have experienced.
I highly recommend you give it a try and think of it as a new way to start and look at life...
find it here: Meditation Gratitude