"...We will never know what is real or is not real about his past..."
Not a "complete" mystery. Everyone who gets sheep-dipped is given a cover story that has at least one living witness at each inflection point who will "confirm" the faux background to any questioner.
Where did Obama get his first job? BIC.
Where did he go? Pakistan.
Who was there at the time? Charlie Wilson.
Who got caught viewing Obama's classified passport? John Brennan.
If you don't know BIC, Charlie Wilson, and John Brennan, then Obama's background will be a "mystery" to you.