I feel the same... I don't know who the real me is either though. It's like I've been this person for so long I've either forgotten who I was or I never really knew, I don't know. I remember my mam telling me that I used to be loud when I was younger, always did things my way, wasn't afraid to let people know exactly what was on my mind and always wanted to be the center of attention. I don't know when things changed or how. I always put it down to just being a part of growing up.
I've been trying new things the past 2 years or so to actually socialize with people again and not shy away. I joined a soccer team and the local group project, among other things. So far, things haven't changed much but I'm gonna keep at it. But you should totally try what Perna suggested. I think that would help.