I have this same problem too. My roommate is also my best friend and we're extremely close. I don't think there's anything she doesn't know about me (except for this forum now). But now that I've gotten serious about weight loss, I'm kind of embarrassed about it. I have no idea why, but I think it's because I put on this aura of "I don't care what anyone thinks about me," and joining a forum about weight-loss is admitting that I do. And I don't like that.
She's been out of town this week so she doesn't know that I've also gotten a GoWear Fit. As weird as this sounds, I'm dreading telling her about it - she will notice it eventually so I feel I should just be up front. The funny thing is we share everything and through our ups and downs (and we've had plenty of those), we have never judged or looked down on each other. Our motto seems to be "Whatever floats your boat, I'll support", which is why I have no idea why I'm suddenly so nervous about this little thing.
Obviously having my picture up and putting up current and starting weights, I'm not too concerned if someone stumbles upon these posts. But I'm not going to come out there and say it. To make it a bit harder, I'm even using a different screen name from the one I use on just about every other site in the world, so I'm trying to be pseudo-discreet. But if I don't feel comfortable telling my best friend (whom I've told a lot more embarrassing and unflattering things), there's no way anyone else is hearing about 3FC from me.
Maybe when I get less self-conscious about this weight thing, I'll be more comfortable talking about my successes and struggles, but for now 3FC is my little haven.