What an excellent question! A friend of mine recently accused me of having a skewed body image (um...don't we all?), so I've been thinking about this a lot lately. For instance, just bought my first pair of size 6 jeans but I feel HUGE today (and yesterday)...I think it's partly due to eating terribly this week (mainly beer and burgers to be honest), not getting enough exercise, and the haunting of vanity sizing (am I really a 6? probably not).
In short, I don't know how I see myself and that drives me nuts. I know when I stick to my running schedule and eat right my weight-loss deflated boobs don't depress me as much as when I sit on my bum and eat poorly.