I have the same feeling, out of the fact that I have not achieved anything I want in my life so far and I can't adjust my targets according to my shortcomings.

Everytime I take a vacation I feel bored from the 2nd or 3rd day and want to _do something_. Maybe I can indulge myself in one night of games/movies but the second night I'd definitely feel very uneasy.

And frankly the older I am, the stronger the feeling is. I want to tell myself that OK this guy can achieve _nothing_ I want in his life and he is almost 40 so maybe relax, but I don't listen to myself.