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Inside Santa Barbara Killer's Manifesto

Alex Stone/ABC News(SANTA BARBARA, Calif.) --  A 141-page memoir details the jealousy and anger Elliot Rodger felt before he killed six people in a furious rampage near the University of California, Santa Barbara.

"All I ever wanted was to fit in and live a happy life amongst humanity, but I was cast out and rejected, forced to endure an existence of loneliness and insignificance, all because the females of the human species were incapable of seeing the value in me," he wrote in the document, titled "My Twisted World."

Police identified Rodger, 22, as the shooter, a man who videotaped his rage over his rejection by women and vowed "retribution" just hours before the killing began. He was also identified as the killer by a lawyer for his father Peter Rodger, who was an assistant director for one of the Hunger Games films.

In the manifesto, Rodger described police visiting him after he uploaded several videos to YouTube. A member of his family had asked police to check on him because of alarm over his behavior and videos.

"As soon as I saw those cops, the biggest fear I had ever felt in my life overcame me," he wrote. "I had the striking and devastating fear that someone had somehow discovered what I was planning to do, and reported me for it."

In a YouTube video titled "Elliot Rodger's Retribution" that he posted before the killing spree began, Rodger sat in the driver's seat of a car as he promised "retribution" and discussed his "loneliness, rejection and unfulfilled desires."

"Girls gave their affection and sex and love to other men but never to me," he said in the video, which he added would be his last.

Rodger also expressed the jealousy he felt toward his younger brother, who he described as socially savvy.

"It is very unfair how some boys are able to live such pleasurable lives while I never had any taste of it, and now it has been confirmed to me that my little brother will become one of them," Rodger wrote in the manifesto. "He will become a popular kid who gets all the girls. Girls will love him. He will become one of my enemies."

Santa Barbara County Sheriff Bill Brown called the manifesto "rambling."

At the end of Rodger’s text, he wrote he felt like a victim after experiencing so much loneliness and rejection growing up.

“I am the true victim in all of this. I am the good guy,” wrote Rodger. “Humanity struck at me first by condemning me to experience so much suffering … I wasn’t the one who struck first … But I will finish it by striking back. I will punish everyone.”

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