I recently interviewed Susan Rich, a consultant specializing in office organization and efficiency, and asked her to explain her view that some of our strongest beliefs about organization are really myths that need dispelling. Time is not manageable. People are manageable.
Activities are manageable.
Pieces of paper are manageable. But time isn't. It's been said that rich people can't buy more hours, scientists can't invent new minutes, and you can't save time to spend it on another day. You can't do anything with time, it just keeps ticking away. So don't keep beating yourself up over the fact that you can't manage time.