I've known many very pretty women who have no confidence at all in their attractiveness... sometimes that's actually a strategy for eliciting positive feedback, in fact, but it's also very real... we are often more critical of ourselves and have a distorted image that can only be amplified by self-doubt, and internalizing some of the misogyny that poisons the larger culture.
I also worked fairly closely (in the same fairly isolated secretarial office, which the two of us shared for several months) with a former model. She was not ugly by any means, but I would never have guessed that she had worked as a model if she hadn't volunteered that info to me. She was, though, one of those sensitive individuals who I felt more or less "read me" without ever coming out and saying things directly. Partly my interests, no doubt, but I learned so much from her and her sharing fairly intimate details about her life to that point (she was in her early 20s, I was no older than 27 at the time, probably closer to 24). We hardly ever talked about anything else, aside from her fascination with the language of flowers, which to me was just one more way she expressed femininity in ways that had little to do with appearance and everything to do with her inner self (and mine). Her mother also ran a secretarial/charm school in Boston, a fairly famous one... we talked a fair bit about that, though she avoided a little bit, I think because her relationship with mom was more than a little complicated.
