Its normal. I've been riding for years and I know I have the same issue.
Kenzie is a very forward, high strung horse. The worse thing to do with her is try and hold her back with the reins. Lots of circles, moving her hinds, etc, are how you get her to slow down and focus.
Yet the other day I caught myself trying to hold her in on a group trail ride, because I knew we were annoying a few off the other riders, by constantly circling, yielding, backing, etc. And I got frustrated at her for tensing up, tucking her nose to her chest, and starting to jig.
I had to give myself a mental slap to stop worrying about the other people, and do what works best for her.
So its totally normal to screw up when you are stressed. I know I do and I'm sure every rider on here does too.