I know what you mean sweets, part of me last year got all huffy cos no one at work had noticed or commented on my losses, then I got all paranoid someone WOULD comment as then I'd have to explain about SW!! I've only told my neighbour, my OH and my closest colleagues at work (oh and a few close friends, the list is suddenly adding up, lol) but I really hate the idea of talking about my weight or my efforts with anyone else, who i don't know very well IRL, does that make sense??
Anyway, I know it's easier said than done, but you really SHOULD hold your head up high and be proud of what you have achieved!
Re: your goals and being worried about falling off the wagon, take it from a professional, it really doesn't matter, it is how you deal with little blips that count! I've fallen off so many times its not even funny this year, but I've managed to clamber back on, and am about to finish 2012 with a good result. I have had some gains along the way, but overall I'm still at an over 2st loss from when I started (soon be 3, dammit!) and I just know if I hadn't persevered and climbed back on I'd be in a worse place than when I started for sure. Sometimes just maintaining a loss is just as good as losing!
Sorry, another long, rambling post, I've never been a believer in short and sweet, clearly!! Hope I'm making some sort of sense! : D. Xxx