The film you're referring to is likely "Star Time" (1992). This psychological drama centers on Henry Pinkle, a deeply depressed young man in Los Angeles who becomes suicidal after his favorite TV show is canceled. While preparing to end his life, he's approached by a mysterious figure named Sam Bones, who convinces him to pursue a path to stardom instead. As Henry's mental state deteriorates, he embarks on a violent spree, all while grappling with his fractured identity and hallucinations. The film culminates in Henry's tragic suicide, broadcast live on television, blurring the lines between reality and delusion. The title "Star Time" might have been misremembered due to its phonetic similarity to "Hannah," especially if recalled after some time. Additionally, the film's themes of mental illness, isolation, and the search for identity align closely with the elements you mentioned, such as multiple personality disorder and a protagonist disconnected from those around him.