If you don't believe in an afterlife, what is your motivation?

[MagicCarpetRide]

So.... this will sound retarded to most of you and you will probably find a way to prove it wrong but what if....
When you die your brain kind of goes off on its own like, Whatever you beleive will happen your brain kind of simulates for you... Like this whole life isn't real it is all simulated in your brain... And you can kind of trigger your brain and decide what will happen yourself and your brain with sort of create an artificial environment that you beleive to be heaven or something....................... I don't know it just makes me think sometimes, Why are we here? And that's one of the few almost logical explanations i can think of.