I think we all, periodically feel like this. If we just went through life without reassessing stuff, no one would move forward.
I know that I always seem to be focusing on some future goal. Then when I get there, it feels good for awhile and then I need another goal. It's always been this way. I try to practice what I preach, but it's hard for me to live in the moment. While, I am happy with my life, I wonder how old I have to be to just "live."