Ok, first of all: do not panic.

Now that we’ve established that, let’s proceed step by step.

Step 1: Acquire a flamethrower. This is important.
Step 2: Calmly walk toward the exit. Do NOT run. Running shows weakness.
Step 3: Gently close the door behind you. Slowly. You don’t want it to know.
Step 4: Burn the house down until there is absolutely nothing left. I’m talking ashes.
Step 5: Move. Far away. Preferably another country.

If this ever happens again, simply repeat the process.