Heh, fair enough (I'm assuming you meant "suspension of DISbelief). Anywho, there are plenty of reasons to be happy, which have nothing to do with belief. Heck, meeting a puppy on a walk is enough, but I don't think that you made this post because cute animals no longer make you smile.
I'm guessing you're more concerned with your overall/average happiness, yeah?
Get a girlfriend and everything will be okay...
Or a boyfriend
Or one of each