Discouraged starting a new job?

Does anyone else just Always get discouraged on the first day or even the first couple of week/ of starting a new job?

I just started a new job working for DoorDash on their support team, and it’s just a bit complex. Yesterday, they had us handle independent cases on our own, and I had major anxiety and didn’t know what I was doing at all. I know this feeling is common , but I just want it to subside or go away. Quitting isn’t really an option for me even if I really wanted to. This job requires me to learn about 10 different systems. And I’m sure it’ll click with me over time but right now it’s just so discouraging. And I prefer to have a better level of optimism about these things.

Some words of encouragement or some shared experiences starting a new job might be nice, thank you :)