Sometimes your world really has gone to shit. There is no shame in admitting that. Despair isn't limited only to people that have mental problems.
So you treat it like any other survival situation: take stock of your resources, focus only on your next action (and on nothing else), celebrate every win that you get, and realize that failure is going to be part of the process, too.
You're going to need every ounce of motivation and positivity that you can muster, and those ounces don't come free. So earn them, no matter how small, and bank those victories for the next day.
Slogging through a long and grueling hike isn't about focusing on the summit of the mountain. It's about taking one step. And then you repeat.
Sure, it might not be fast, and it might be hard as hell, but if you just don't quit, you will make it through.
In other words, "just be positive"?
For incredibly poor interpretations of the phrase "just be positive"