Afterlife, or how ever you would call it, cannot be proven nor disproven. It may be there, but then again it may not.
People from all kinds of backgrounds have had near death experiences in whih they claim to be able to lift up the veil a little. Based on the gospel of John and his letters I could come to the conclusion that knowing God is the eternal life itself. There are others who claim this afterlife to be in heaven and ofcourse our JW heritage tells you that afterlife might take place here on earth.
Whatever you choose in terms of what an afterlife may be, it basically is a vehicle to overcome fear of death. Whether it is true or not, being persuaded to believe in afterlife, is a comfort in itself. But then again, seeing the truth as being an afterlife is non-existent may also do the trick for you.
Cross that bridge when you get to it, i.e. when you´re there and ready for it. In the meantime, lead a rewarding life, read about psychology, devolopment of cosmologies, philosofy, etc, to get an idea and a broader view on things.
Cheers
Borgia