@doggywuv In the multiverse, where everything has already happened, you do exist for all time.
In the universe you inhabit, every action you take creates chains of cause and effect that ripple outward, for all eternity, changing everything. In Quantum Theory, this is called a wave front. Theoretically, if you were sufficiently aware, you could direct the whole universe like an orchestra, by choosing to do one thing rather than another, allowing effects to magnify through the butterfly effect.
Alas, we are limited to our singular points of view.
Or are we? In Quantum Theory, there is a phenomenon known as “superposition” where an electron can be in two places or two spin states or two universes at the same time. According to the Many Worlds view of Quantum Theory, the universe we live in is constantly branching into alternative parallel universes. However, every time we make a decision, the wave front we set in motion collapses all the other possible branching parallel universes, locking us into a specific reality with it’s specific moral trajectory.
In death, we lose the ability to decide; so whatever consciousness is sustained by this process very likely stops; at which point, consciousness may very well occupy multiple points of view in multiple universes because we create no wave fronts that interfere with quantum superposition. In one universe, I am me and you are you; in another, you are me and I am you; and in another universe, we are both someone else. If you think about it, it becomes pretty clear that we should treat one another much better than we do.
You look too young to recommend strong drugs like LSD or DMT, but I can recommend something that won’t make your mother furious: a real mind-blowing book, “In the Garden of Forking Paths” by Jorge Borges . The most celebrated story in that book, and my favorite, is the The Library of Babylon, which is now often called Borge’s Library and is a key metaphor in the new biology. What is most remarkable about Borges is that he wrote about all of this in the 1940s.