Dead is dead, and nothing but. This is the simplest possible assumption, and so in the absence of any evidence from beyond the grave of life after death it is most likely to be correct.
To say that this can't be so because you don't want it to be so (maybe because it scares you or something) is to assume that wanting it to be so in itself makes it so. Sorry. Learn to live with the immeasurably vast indifference of the universe to your hopes, fears and desires.