LISA RICHWINE AN emotional Britney Spears has called the 13-year-long conservatorship that has controlled her life stupid and abusive, saying she felt traumatized and angry and wanted her life back. In a statement of more than 20 minutes, pop star Spears, 39, told the Los Angeles judge overseeing the arrangement that she wanted it to end. "I just want my life back," she said. "I'm not here to be anyone's slave." "I'm traumatized ... I'm not happy, I can't sleep," she said. Spears said her frequent upbeat postings on her Instagram account were lies. "I'm so angry. And I'm depressed.…