Mark-11,
If you're still following this thread.
As you can see there are many pausible answers but none will ever be conclusive.
Who was I before I was born... not physical
Who will I be when I'm gone... not physical
The only time I know is now the past is a memory and the future is a dream so the only time I can experience myself is in the now and even in the moment that it is written that now is already in the past.
Who was I before I was born? It doesn't matter.
Who will I be when I leave? It doesn't matter Because I am here and here is my now moment, it is really the only experience that I own. From this point I cannot change what was nor what will ultimately be. I can only change what is my thoughts in my here and now.
Was I a being before I was born? perhaps though I doubt it was of the limited consciousness that I experience in the physical. It is probably even a different type of consciousness. Science has shown that all things are energy energy cannot cease to exsist although it does change form.
Who am I?
Right now I am... looking forward to the now momment where I'm enjoying my late lunch 
Enjoy Life
Alex
