What is the story behind your favourite Taylor swift song?

I'm writing a story and I like basing it on songs and I'm getting sick of me old story :L it's based on Jessie j's song "who's laughing now". Basically The main character Jessie doesn't feel beautiful when she is because everyone hates her and bullies her. Then she makes loads of cash and falls in love with someone but he leaves her and she goes mental and goes to an asylum ... Bit rubbish I know :L that's why I want to read your opinions, that and I like writing about love I've never had before :'( (I've never been in a relationship) so please help :')