I know exactly how you feel, but - if I may give you an advice - don?t do this! don?t be affraid of showing people you?ve changed. It will only bring you to isolation.. you have to go out, even if you will only "play" that it is you. You know what I mean.. I don?t want to be a smartass, just trying to tell you what works for me (just a little bit - anything helps, ne?).
I wouldn?t say this if I weren?t in the same condition as you are. I am. I miss myself (my former self) SO MUCH. I loved life, I loved every single feeling of it. I loved being "cool" with people and everything... now it?s all gone.
BUT - after few months of isolating myself from people I knew (because they would see I am gone) and trying to avoid places I loved (because they only give me memories), I found out I have to do the opposite. Be with friends (and even tell them what happened to me) and go to favourite places (just to remember the old feelings and trying to find them in myself).
Haven?t cured a bit yet, but - if nothing else - I am living the life once again. Not the life as I used to (far, far from it), but at least - I live and hope again.