I think it is possible to hide your depression. I did it by overachieving to some extent. But I think that was all just a way to prove my worth somehow (an impossible task, there is no proving self-worth, I wish there was). I used to think (and still do to large extent) that my intelligence was my only redeeming feature. In fact almost all my "success" to date has been due to "puzzle out" situations.
I'm hoping to find some good qualities of me that is not related to my mind in some way (I like to think that honesty is one, but I am not always honest).