I always thought it was about a girl having a crush on another (heterosexual) girl, and fantasizing about that girl falling in love with her, while she knows she's been "everybody else's girl", and will never be "her own". The end is about our girl hiding her lesbian passion under fake relationships, heterosexual 'romances' that family and friends would consider 'good' and 'quiet', but still calling her baby, and seeing hope of happiness slowly fading away. But that's just an intepretation, the introspective ones you have reported seem to be even more interesting.
I always thought it was about a girl having a crush on another (heterosexual) girl, and fantasizing about that girl falling in love with her, while she knows she's been "everybody else's girl", and will never be "her own". The end is about our girl hiding her lesbian passion under fake relationships, heterosexual 'romances' that family and friends would consider 'good' and 'quiet', but still calling her baby, and seeing hope of happiness slowly fading away. But that's just an intepretation, the introspective ones you have reported seem to be even more interesting.