Should you ever despair at life so much that you want to die, you have the means at hand and yearn to end your life, you have written a suicide note to those you will leave behind and you are prepared to die… At that moment, stop.
Get a pair of scissors. Cut away at the note until you end up with a piece of paper in the shape of a key. Go to a door, any one will do. Push the paper key forward and turn your hand as if unlocking an imaginary lock.
The lock is real. Open the door. There you will find it. The other Earth. The one that awaits to replace this one when it dies. That death is inevitable, but in the meantime the other earth will belong to you. Be warned: the other Earth is very different from this one.