I've watched an awesome TED talk
The Magic of Not Giving a F*** | by Sarah Knight
My experience: During last some years I've been reminding myself to concentrate on the priorities. It did not help a lot till I started practicing not giving a fuck to as many things as possible. This tactics magically brought me much closer to realizing my actual priorities in a much shorter time.
The side effect of not giving a fuck philosophy is that you actually start concentrating what really matters to you and live a much joyous life than before.