No matter what the character is, I just say to myself 'If I, Melissa George, was in that situation, how would I react?' and once you do that you can just go for it, and hopefully the performance comes through.
I want to suggest a feeling. It's ridiculous to assume you can state an opinion. Somebody else can never relate to the lyric in the same way because their whole experience is different. You can only suggest, then people add their own history and experience to the lyrics.