Tony there are no

Years ago, Howard Stark told his son, who was in a Captain America costume, that there were no superheroes. Tony grew up believing that there were no superheroes. And when he tries to prove that there are superheroes, and he himself can be one, his father's words come back to him.

Prompt fill for avengerskink:

Mini!Tony is running around as a kid in a Captain America costume. Howard is busy working at something, and Tony gets on his nerves a little too much. Howard snaps something along the lines of "There are no superheroes Tony. Grow up and stop believing in childish things."

Later we see Tony working on something technical, the costume crumpled and abandoned on the floor, because there's no such thing as superheroes.

Based on this prompt, Tony grew up believing in technology, because that's what his father had taught him. When he escapes back from Afghanistan, he continues the weapon manufacturing, because he is more determined that weapons (the guns on the suit) can protect people, not the person him or herself. But secretly, he works on the suit – the Iron Man suit.

Something Extra: The Epilogue where Loki wins because Iron Man isn't there to protect the Earth.