I wouldn't worry about dragging, Like Dan said, the biggest effect is it scares you. Just stay relaxed, and have fun. The only other thing I would say is, If and when it does happen, pay attention. Its good to know where that peg is. Once you know exactly when your peg drags (in terms of lean angle) you can throw the bike over to exactly that point. The only time its gonna cause you problems is if you don't know where that peg grinds, and throw it over to a lean angle much greater then peg grinding angle. There is a big difference between dragging a peg, and slamming a peg into the asphalt. The first is fun, the second will probably upset the bike.