On what site can I race Nascar against anyone in the world

You can race in NASCAR, Cup or Truck, or a couple of other series on iRacing.com. It costs a pretty penny and you need a steering wheel controller (preferably a logitech) and a good computer. It is a true racing simulator, Dale Jr. uses it frequently. They laser scanned the tracks so every bump you see on the track will be in the game and everything in the game is comparable to real life, which is why the membership is high. It was built around the platform of NASCAR Racing 2003 and made by the same manufacture. It is downloadable and costs right now $7.50 a month. Click on the link below for more info.