How about this, you are a unsubstantial collection of particles and properties mistakenly believing yourself to be a substantial being. You neither came into nor will you go hither. Your body will remain as with all matter, your consciousness will dissipate once the electrical impulses cease and the identity you call yourself will fade with it. Just like a mirage does when that part of the earth rotates away from direction of the sun.

We have formed ourselves out of our forms, and as we have reformed them we have re formed ourselves, and to an extent it is out of wonder, because every form has only a hypothetical existence, and can never completely define the reality it reflects... All concepts are a work in progress, never certain, never exact, never completely abstract either...

I doubt if you will find any absolute answers to those perennial questions here, but I suspect that the questions themselves may be clarified or that you may find different perspectives from this thoughtful community.
Welcome to Philforum!
Regards,
John