Thanos betrayal?

you were an avenger and you went on a mission that was only supposed to last two months but when you went missing for a year the Avengers thought you died. The mission was to act like a loyal follower for Thanos, ti give information to the Avengersers, but as every mission ever something went wrong. you had been stuck as Thanos'es soldier for way longer than expected. When the war happened you got the chance to go over to the Avengers again. btw this is when everyone had come through the portals. you can choose everything about yourself but your wering a mask to not be attacked by Thanos'es army if you ever came back (only Thanos and a few other soldiers know what you look like), so the other Avengers dont know its you. btw your name is y/n untill you change it. i almost forgot your powers are super strengt and speed (not as fast as Quicksilver just faster than the normal human), and anything else you want