Actually, most people get to see about 50 to 60 percent of the "real me".
The only people that see all or most of the real me are my mother and boyfriend because I don't usually let people close to my heart.
It's a sad fact, but letting yourself be that open and vulnerable is just about the best way to get that openness thrown right back in your face by someone and used against you.
As for rejoicing in letting people see every aspect of me, not one bit. It's absolutely terrifying having to place trust enough in someone to show them who the real you is.
When the rare occasion does come about that I trust enough to let someone in that close, it is a bit of a relief not having to hide "the real me" anymore though.