Welcome to the boards.
I suspect that anybody who'd worry about whether folks are pretty or not wouldn't make for a good nudist. The nudists I know haven't ever mentioned that being a requirement or expectation in the nudist community--even the best-looking among them haven't indicated any such thing. I'm not a nudist; I do, however, belong to a community that has nudist members. We just had a regional burn this weekend with lots of naked people walking around and nobody really seemed to care that some were fat, some saggy, some wrinkly, some ugly. It didn't matter what anybody looked like, as we weren't there to engage in any sort of evaluation of physical attractiveness.
I imagine the nudist community is much the same.
So why do you worry about how you look? What is it you fear will happen if people see you as you are?