In real race you can't go 100% from beginning to end, that is not too well simulated yet, driver part of that is not probably going to be simulated ever
I don't know if I'm really a racer but when I'm on track I'm sure afraid, brake faiding is perhaps thing that I'm most scared of, it just hits so suddenly on my car, nowdays I know that if I go 100% it is only 3-4laps when I will loose 70% of braking power and it will come almost instantly.
Then track where I drive has kind of corkscrew it is uphill when laguna seca has downhill, not nearly as bad as in laguna seca, but I have not yet been able to drive that properly, too scared
With LFS you can get much better idea of real racing when you have 3 pedals and DFP (set to 720 degrees) and H-pattern sifter positioned same way as it is in your car.
Lap times will be slower, but still G-forces are missing and steering is not like real life, it is rather light at center but when you turn more than 45 degrees you need to start fighting, also G-forces pull you one or more directions, now add to this those walls and few other cars, heat and funny smells.
You will be hell scared at first, when you get adjusted to all this new enviroment that scared feeling will be going away, with more practise it may almost disappear, but just almost.
Sim racing is good but compared to real life it is just so limited, however simracing helps to open window to racing, lines and such stuff are much easier to understand.