Lyric discussion by Gabigs 

Cover art for Obvious lyrics by Christina Aguilera

Yes, I think it is free to your interpretation. I remember Christina back then in 2000 saying that this was her favourite song in his first album. And I think it shows her voice alone with a piano showing how much of a soul and a power to get straight to our hearts through it, even when she was only 17 when she recorded it. To me it has to do with a girl sinking in depression for the first time, holding too much inside of her, and of course I did relate to that.