I agree man it's all in the head!
When i first started racing RC I would get really out of shape when things wouldn't go exactly as planned, afterwards, with more time and experience I learned to stay calm no matter what (even if my hands still shake i'm still in total control of the car). It get's to the point where i loose the notion of time and I'm just hitting fast consistent laps and after a while i look down at my mechanic to make sure he is still watching the stopwatch Because i get the impression that i'm doing the same lap over and over lol.
The best feeling is when you block out the announcer (and everything around you) and you just drive then you hear him say 1 minute to go and you're in first place
BEST FEELING EVER!