KRISTEN Stewart thinks appearing in the Twilight series could have made her a psychopath. The 19-year-old actress - who plays Bella in the vampire film franchise - decided to take on different roles while making the Twilight movies to ensure she didnt become too immersed in them. I think I would have been a psychopath by the end of a four-year stint on the Twilight saga without anything like that to change it up, said Stewart, who recently shot Joan Jett biopic The Runaways. Kristen admits she was unaware how much her life would change when she took on the role of Bella, who falls in love with vampire Edward Cullen, played by Robert Pattinson. She now finds it hard to complete everyday tasks without being mobbed by fans, but is convinced the interest in her life will die down. I have a really strong feeling that this is going to go away, that this is the most intense its going to get - and could get - and that its fleeting, she said. Id like to take more walks after work, instead of having to come back to my hotel room and not leave. SS Some nights, I think, 'You know what? I dont care. Im just going to do what I want to do. Then the next day I think, 'Ugh. Now everyone thinks Im going out to get the attention. But its like, 'No, I actually, for a second, thought that maybe I could be like a normal person. Stewart recently revealed she hates having to lock herself away in her hotel room. SS