Be a believer. If you're not a main character, suicide is a quicker and easier way out. Don't be a smart-ass. It'll only get you killed. When you have actually gotten a monster down on the ground with your gun, immediately empty all your shots in the mosnters' head.
People driven by veangance always die.
Mentioning any goals in life, anything to look forward to, or any loved ones will get you killed. Never, under any circumstances, go to summer camp. Puzzle boxes are hard to solve for a reason. Of course, it WILL be waiting for you in the car as you go to leave. If you try to run away, always take the bus.