the title is provocative, but the content is better. it's funny how grown women are referred to as girls, yet it's less common that grown men are referred to as boys - in my experience.
I prefer to describe myself as a girl. It's the female version of "guy". "Woman" is stuffy and formal, and it makes me feel old. When I hear the word "woman", I think either Hillary Clinton or somebody's grandma, neither of which I have any desire to be. I only use the word "woman" in formal contexts.
Lady and Ladies is another set of words that could be used.
It's interesting that "Woman" is seen as stuffy and formal, whereas "man" is often used like "be a man" or "man up".
You usually have to put an adjective on "man" to give it a negative connotation, in my experience.