Think of the solution, not of the problem.

-- Terry Goodkind, Wizard's First Rule

Having your thoughts run in a loop about why your situation is horrible won't make it better. If you lock yourself out of your hotel room in your underwear, standing around in the hallway worrying about it isn't going to make going to the front desk any less embarrassing. You need a room key; go figure out a way to get one!

See also.