I'm not entirely sure that Lewis Hamilton would be good at GT6.
What's your video-gaming background?
Are you using a controller or wheel?
You say you love cars with a passion - does this mean that you actually devote a fair bit of your consciousness to RL cars?
There is a lot in GT6 that has nothing to do with actually
driving the cars.
As for becoming proficient at the game - if you are new to the series, then start small, and start slow.
Master the low PP races in Career mode. Get to know the cars well. Give your muscles some gaming-memory.
Play with the cars. Learn how they react. Then move on to higher-powered machines.
Eventually you may be good enough to join GT Academy. And you won't be the first to do so that way.
Becoming an alien overnight has never been heard of.
Hope that helps. If you are really serious and not just wasting our time.

👍