How to be optimistic and love life?!?

I usually go through every day just going through the motions. All I ever really look forward to is sleeping. It's not that I'm sad or angry or depressed, I'm just not enjoying myself. Life just seems... well, boring. I laugh and everything, and do interesting stuff, but I'm not really happy. I want to really LIVE life and love it, and have a grand ol' time. Any suggestions on how to just let loose and enjoy every second of life? Live it up? Live to the fullest? As they say, carpe diem! Yep, it's cheesy. And I like it that way.