Don't be too hard on yourself. It is very difficult to do a sim check in the beginning of your career to get that first job.
Most of the time it's on a type you've never flown and with a partner you've never met. Neither of you have any airline experience. If you have completed an MCC course then most likely it will have been at different schools on different types
So it has all the ingredients for disaster
But one failed sim session is not the end of it. It's just that there can be a long wait for the next one...