You had made a time machine, which didn't use too much power so you got it working, however, you accidentally set it off, sending you back to the 1940s. This wasn't that much of a problem, because you knew how to fix it, but for that time it was quite big of a power source. So you just had to figure out a way to do it.

You were looking around, ending up in a street and seeing your father, Bucky Barnes, back from when he was in his 20s. ''Hey kiddo, can I help you?'' He asks, since you seemed kinda lost.