Britney Spears has been quietly working to end her controversial conservatorship arrangement for years, as it was demonstrated by confidential court documents.It was reported that the iconic pop star had been forced to perform against her will, with restricted control of her private life and very little access to her finances.Now a never-seen-before document has been obtained by The New York Times, which reveals that Britney is “sick of being taken advantage of.”The 39-year-old star stated in