Carly Simon claims she was disadvantaged as an up-and-coming singer in her fight to conquer stage fright. “Everyone in the ’70s was stoned in order to get onstage, but I was afraid of drugs . . . Now I’ve grown to love them,” she told the crowd at the Bruno Walter Auditorium during the first New York edition of a series hosted by LA’s Grammy Museum. The Post’s Frank Scheck reports that Simon, performing with a band that included rapper John Forté (recently released from jail after doing time for a drug conviction), sang new versions of “You’re So Vain” and “Coming Around Again.”