I would gamify the situation. As I treat a lot of situations as a gme in my life.
I would challenge myself to survive as long as possible. Creating a plan: what do I have as material, how much food / drinkable water do I have.
Every 7days would be an achievement and I will 'celebrate' by something tasteful or fun I could do.
In essence I would try to think as practical as possible: how to fish (for food), how to collect rain (to drink), how could I get some sleep, etc.
I live by the idea that everything will be alright sooner or later, so I will hit land / being rescued!