You may not able to control every situation and its outcome, but you can control your attitude and how you deal with it.similar to what I say a lot.if you can't change the situation, the only other thing then that you can change is your attitude.
Sometimes the "I would love to: see that person, do that course, get that body I really want, spend time by the ocean or out in nature, travel to that picture postcard place etc" . Becomes a distant memory. How sad is that? How sad it is to substitute