Marvel! Performing Surgery on Iron Man from the Start

Can someone tell me why Iron Man was lying beside me when I woke up, and why it seems I just performed surgery to remove shrapnel from his heart?

Wait, how did I become that old guy who gets killed off within five minutes?

Damn, is this difficulty level from the start set to hell?

An infinite world that begins with Iron Man. The movie worlds featured are primarily from Marvel.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.