Do you have evidence to prove that? no because i have never seen someone comes back to life and tell the facts
Yeah, that's not how the burden of proof works, buddy. You need to prove that heaven exists; you don't need to prove that heaven
doesn't exist. In the absence of any other evidence, "nothingness" is the default state.
EDIT: Admittedly, I was a bit too assertive in my original comment; I was expressing my personal opinion, but it would probably have been better to say "In the absence of evidence for heaven/hell/purgatory/limbo/reincarnation/ghosts/spirits, the most reasonable assumption is that your consciousness simply stops existing."