Your spirit is indestructible and will go into an "ether" state to await its reincarnation into the next suitable new born human within 21 days of conception and establish a new personality. The next re-incarnation depends on your pass life experiences/knowledge and how it is utilized in order to "balance" this equation in the next life.
The body decays and some of the past personality "essence" remain in the bones for several hundred years. If you're sensitive enough, void of ego, then you can become aware of this "conscious" in all living things, including plants, words both spoken and written. Every single human has this ability to "communicate" amongst themselves and other living things, just need to develop that ability through "free will" and other means of concentration, including technology. The spirit in each does not adhere to religious doctrine, which stagnates its development, but rather "seeks" its ultimate path to absolute Creational energy, through knowledge and experiences gained through numerous physical lifeâ€™s(60-80 million years). After this period, the spirit no longer needs a physical body to gain knowledge and experiences. It becomes semi-physical and offers "guidance" to physical humans, if they are willing to seek it, no orders or dictation is rendered because of the creational laws of free will. From this semi-physical state, more experiences are gained through others of the same level, but at a much higher frequency level, beyond words or concepts that physical humans are not capable of. Then the spirit "transforms" into a purely energy state of Creation, where it then creates more life and universes to continue. Takes billions of years to get there. So, the real question is not to worry when you're going to die, but how you conduct yourself in this physical world is what that matters. Seek a higher conscious "awareness" through positive actions, meditation, good works that help elevate humanity to its ultimate realizations/development. When you help others to gain "awareness", you also help develop "your" spirit too. But must be done without expecting something in return, the spirit cannot be bought or sold. This also applies to the Plejarens and other advanced entities throughout these universes. They can "learn" from the experiences of other "undeveloped" status humans.