Death is not a central theme in Judaism. In ancient Egypt it was.
Egyptian priests mainly ministered to the dead.
Jewish Cohanim were prohibited to have contact with the dead. None of the Korbanos (temple sacrifices) were offered on behalf of the dead.
Kadish is not a prayer for the dead, but an obligation for the sons to “step up to the plate” and sanctify G-d in THIS world.
Too much thinking about death is not healthy and a psychologist should be consulted.