I can’t do it

The data collection part is so confusing. I can’t get the hang of it. Got hired with a new company and they trained me on all the things really fast and crammed into 5 days. And I couldn’t do the practical exam because I was too nervous and confused. I asked the trainer what the next steps were because I know I failed, and how I can get back on there. She said she didn’t know. Really?? I’ve decided I’m just too stupid and useless for any job. I’m in my mid thirties and I can’t stop failing. I just want to give up.

UPDATE: I was fired