Only the Beginning

I recently felt very sad for no particular reason. I realized that my life has changed so dramatically in the last 4 years. Friends have come and gone, people changed, and I have suddenly found myself left behind. Well that's not entirely true...I guess I just found myself on the edge of opportunity and just waiting for things to come to fruition. I don't know, I'm smart, I'm confident, and I have amazing friends...why is it that I still find myself unfulfilled?