I think besides practicing restraint, it's also about playing hard to get - "I wanna be someone they don't want me to be"and "don't wanna be the little girl they kissin' goodnight" - because she's been too "easy" in the past. Men are taking advantage of her and thinking she's loose, so they'll walk all over her. She realizes she'll be more valued if she doesn't do whatever they want her to do.
I think besides practicing restraint, it's also about playing hard to get - "I wanna be someone they don't want me to be"and "don't wanna be the little girl they kissin' goodnight" - because she's been too "easy" in the past. Men are taking advantage of her and thinking she's loose, so they'll walk all over her. She realizes she'll be more valued if she doesn't do whatever they want her to do.