From the peanut gallery, there was a little loss of situational awareness, had this happened in real life your CA would have had a debriefing item post flight.
Because it’s a linecheck in the sim it’s a fail.
For passenger’s comfort you should have let that taxiway go by.
What if you would have had an Autobrake malfunction or speed brakes/spoilers not deployed?
Would you have jumped on the brakes to make the turn off?
Very very very few people make it through an entire career without a scar or two.
So you’ve got your first one.
For future reference if it comes up during an interview, start off by saying it was unsatisfactory because you made a mistake.
Thats the only thing a (hiring) panel wants to hear.