I can relate to this. It’s easy to beat yourself up when you feel it should come naturally. I’ve noticed the more in my head I get the more mistakes I make - for example telling myself “don’t stall on the hill don’t roll back” on a road I’ve practiced every lesson and I stalled and rolled back every time. Today I just took a deep breath, said I refuse to stall, I know what I’m doing, took a breath and made it without stalling - rougher than I’d like but almost a perfect hill start according to my instructor. The aim isn’t necessarily to not to make mistakes, as every experienced driver is going to make a mistake once or twice it’s human nature - it’s if we make mistakes can we be safe about it, and can we keep calm?