Imagine a tunnel - a corridor - that leads you from one room to the other. Everytime you pass through a room, a door closes behind you. A conveyor belt moves you forward into the next room. You can turn around and start walking in the reverse direction but it won't get you anywhere. So, you jump off the belt and walk to the last door that closed behind you. You knock and you pummel on the door with your fists. You can hear echoes in the hallway. But, the door won't budge an inch.

That's life for you, sweetie.