This is my winter motto, to go with What Now's "suck less." So you can't figure out where a potentially useful half-hour went and why you're now late leaving for the gym? Don't make it worse by stewing over what you were (or were not) doing with that half-hour. It's not going to get any earlier if you realize how long you spent reading the newspaper. You're late with some project? Don't make it worse by letting embarrassment about being late cause further procrastination; get on with it.
Don't know why you haven't yet done X, Y or Z with your life? Well, don't make it worse. If you really want to do those things, get started. It'll never be any earlier.
It sounds a bit grim (and feels it, too), but it's better than the stewing.