You were a winter soldier, like Bucky, but you were more enhanced. You were part of the elite he had mentioned.
They speak thirty languages, can hide in plain sight, infiltrate, assassinate, destabilise, they can take a whole country down in one night and no one would see them coming.
Sam didn't believe him at first, but he did once he saw what you had done when you escaped Hydra's containment. A massive underground Hydra facility in Sokovia with all of its members dead. Unrecognisable, practically heaps of misery on the cold stone floor.
They found you passed out, about 20 kilometres from the base in the middle of a thick Forrest with countless tranquilizing needles sticking out of your neck, stomach and arms. You had made it so far before passing out, it was remarkable, but you weren't a god.