You stop being a girl after you've evolved into a woman silly. 
That's what I thought, she's like 20-24 ...................
...... Or he.
See, now that one's debatable! Do you turn into a woman with age, or do you turn into a woman when you have sex, or is it some other arbitrary thing?
The sex part would be popping that cherry thus turning you into a real woman. Wait, ... no. Just leave your quote as it is. I do laugh at it once a while, at least with several other quotes under avatars from other people.
I dunno. Woman sounds too mature and old for me. I'll probably still go by girl even when I'm old and decrepit. Which... hopefully never happens!
Exercise and eat healthy. Or you can do jack shit and your body will degenerate and become ugly, fat, decrepit .. whatever .. Come to think of it, I remember you mentioned that you do exercise.
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I can't seem to sleep, I need to sleep. Now. I wish there was something strong enough to knock me out for a few hours. If I had a million dollars ... I would ...............