I am not a "woman". I don't know if I ever will be (if this is connected to bearing children, then the answer is "no"), but I'm not one now. I am also (at 28.75ish) getting a bit old for "girl". And even if that's not age-defined, I just don't feel like one. "Young woman", to me, still refers to a "girl", just one who's over the age of, oh, 16. (My high school graduation age is entirely coincidental.) "Young lady" is an epithet -- something you call someone who's misbehaving (I often use this phrase tongue-in-cheek to chide my own mother, age 63, about something). "Female" is scientific -- "the female of the species" [...is more deadly than the male?] -- and doesn't make a great noun. Anything else I can think of, like "chick", is too slangy for general use. So....?