LOS ANGELES (AP) _ Just days from her 20th birthday, pop star Britney Spears says her new ballad, ``I'm Not a Girl, Not Yet a Woman,'' is her favorite song because it captures her state of mind.

In the song on her new album, ``Britney,'' Spears sings of being at an age where she feels she's ``caught in the middle.''

``It's really where I'm at right now,'' Spears said in Sunday's edition of the Los Angeles Daily News. ``Yes, I'm on the verge of being a woman. I need my own identity. I need to grow and do things on my own.''

Spears, who leaves her teen-age years behind on Dec. 2, is on tour through late December.