Yes, it’s your desire. Of course.
You’ve always thought this. If you thought another way, I’m sure you’d remember. If someone told you to think this way, that would stick in your mind. If your very own desires and needs had been molded to another’s specifications, this is something you’d realize.
The proof would be inescapable if you’d been brainwashed—slowly, inescapably, thoroughly—until your body was a vessel and your mind was my plaything. You would know if this had happened.
At one time, you did know. Do you remember? Any recollection of the last word you spoke right before you ceased to be an independent human?