I want to tell you a great solution to your problems, no matter what they are.
When you face difficulties, and when you feel too tired to get over them all, the simplest step that
you can take is to...sleep. Easy, right?
You may think that it is strange. But really, when you sleep, you can run away from the reality even if it is only for a while.
If you sleep, at least you won't feel the pain you have in the real world. Even if you have a nightmare,
it is still better than dealing with the nightmare that you see once you wake up. 
The point is that if you ever feel like disappearing from this world, don't do something stupid like cutting yourself or consuming drugs. Just sleep and hope that everything will be alright..