Los Angeles, August 20 (IANS) Actress Kristen Stewart believes that people should not regret or blame the past, but take responsibility for their own happiness. The 26-year-old actress, who previously dated her “Twilight Saga” co-star Robert Pattinson for five years and is now in a romantic relationship with her assistant Alicia Cargile, says she prefers to feel sadness and learn from her pain than shut off all her emotions, reports hellomagazine.com. "I've been destroyed. Absolutely. And thank god I have too because I would not exchange feeling so much for feeling nothing at all. I think the worst that can happen to a person is when they start shutting their emotions down,” Stewart said.