Is Shadow's truth from the game even real?

Ive been a Shadow fan ever since I was a kid and my goodness im obsessed.
I would be analyzing his past from the games he was featured.
And supposably Shadow the Hedgehog game told the truth about him and everything is happy ever after and put the past behind. But thats it? He just works for G.U.N even after the horrible things that has happend to him?
Something is not right.
Reaserching the theories,comics, the games, creepypastas and so on are trying to find his true past.
I still pregunta SA2B because Maria was so important to the story especially Prof. Gerald. If the game would have told más information about them, then Shadow's purpose would matter more.
There is still más about Shadow than what we know already. His future later when Sonic ages, I wonder más and more.