i do worry also whenever i fly but i've never had any comments so far. i dont know but it seems passengers are more oblivious to smell inside an airplane maybe because there are too many different smell inside there that kinda mask my odor.
bring a perfume and put on every few hours to mask your smell should you feel conscious.
just relax, the more you are stressed the worse the smell is. there is really nothing you can do about it. just remember you wont be seeing this strangers again.