LIEV Schreiber is always a wreck on the first date. “I’m really no good without a script, and I get incredibly nervous. I get very red, and I sweat profusely,” he tells next month’s Elle. The star of “The Painted Veil” also says he’s misunderstood: “I come off as psychotic . . . I’m misrepresented as a scary person. I’m not. It’s all about my size and my eyebrows.” Despite his insecurities, Schreiber still makes out OK, even enjoying sex in public places: “I once had a very fun Sunday on the Staten Island Ferry.”