You were an experiment that's gone wrong, at a Russian base you were in a cell with chains on your neck that are attached to the wall, the Russians wanted to know if they can turn a human into the Indoraptor from Jurassic World and to their surprise it worked. A little too well, you can still somewhat speak, Ghost came to the base not really expecting to find a live experiment that is until he saw you in your cell

Ghost: What are you...You kinda look like that thing from JW Fallen Kingdom...