The way you drive in the game doesn't necessarily mean you can and/or will drive the same way in the real world (and vice-versa).
For one thing, GT6 is not a perfect sim. It is very good and emulates real world-physics, but it has it's flaws. It also sometimes turns people into fearless drivers who remain unfazed by full throttle, hard cornering and the general idea of crashing. With real world danger out of the picture, everyone gets a boosted sense of bravery -- This can lead to some very fast driving from people who wouldn't dare push a car that hard in the real world (even if they potentially could), but also often leads to a lot of crashing due to lack of caution and/or being so close to the car's limit.
But at the same time, I myself find GT6 driving difficult compared to reality in some ways.
*You have no depth perception, so it's hard to tell how close/far away things are.
*You see no movement in your peripheral vision, so it's tell how fast you're going.
*You feel no g forces, so it's hard to tell how hard you're accelerating/decelerating/turning.
Sure, you can see all of these things on the screen, but you can't feel them. Actual driving gives you a lot of sensory input that your brain can use to help you make better judgements. In GT6 you have to get used to driving in an incomplete representation of reality, and that can take time depending on your skill level.
So your answer is probably, as some have already said, "Not necessarily".