what am I doing wrong?

So I signed up for the biggest looser contest at our Y. Work has been nuts BUT I have been working out on my own & keeping a food diary...well I still haven't lost anything. Told my sister I will forever be fat and ugly. I am getting very frustrated. I don't want to stop but I feel like I am looking at a 15' wall and all the fit folks are on the other side making fun of me...