It does get a lot better after a couple months. During my first month I thought I’d never learn, and I’d feel terribly anxious during and after a busy shift. I’d have really bad back and neck pain as well. Then I started to build up confidence rather quickly after studying the drinks at home and just getting more practice. The pains went away as well. You will be fine as long as you put the effort in, and your coworkers will warm up to you too.

However, Starbucks is pretty high-stress regardless of your experience. So if after a few more weeks you still feel this bad, you might want to look at somewhere else to work. I wouldn’t risk my mental and physical health for this job.

How in the heck could you have been more proactive with finding coverage? You posted about getting coverage the night before! Also when you're sick it's only a curtesy to find coverage for your shift, it's not required.

I’m 6 months in and still slip up, it gets reasonably better. Your sm shouldn’t get mad at you for calling out sick with no coverage, it technically is they’re job to find coverage for you. Don’t let starbucks’ management get to you. We all got our beef with the sirens.