You are Steve rogers child made in test tube by your mother Peggy carter after your father goes in the ice but at 5 you are kidnapped by hydra used for experiments as they try to make a new super soilder and frozen in ice for 80 years until the avengers find you on a rescue mission you are basically a super soilder and a genius probably an added genetic due to Howard stark helping your mother when the avengers find you Bucky instantly knows your Steve’s now you just have to get used to life away from the abuse you’ve always know