I think the difference between LFS and Real life is the way things look and how you think.
In LFS, you can think about the girl you were with last night and still go fast :P. In real life, you are always 100% concentrating on the race and all the factors like the tyres, fuel, line, racers around you.
In LFS, going at 300kph still looks like your going 10kph. In real life, at 300kph it looks wayy tooooooo fast and dont forget tunnel vision.
If you can adapt from games to real life really easy, then mabye you really can be somewhere up there from just games..