Listen to the people that have worked there forever. They know the secrets.


Also, pay attention to the register. It has al of the answers to what’s in the drink.

Quit.

I usually tell them the beginning is the worst part. Because starting at sbux can be so discouraging.

Don't quit. Yeah, there are a lot of negative things that come with this job - but there can also be a lot of positives. I'm a big advocate of finding the benefits of whatever situation you're in. You're going to gain new skills, meet a lot of new people (good and bad) - that'll hopefully grow your patience, awareness, and experience - and make some new coworker friends (hopefully).
Now, I will admit that I am newer and haven't been a barista for long but I have worked other service industry jobs and dealt with a lot of crappy jobs/people. Just don't let it overwhelm you - life's too short for that. Just smile, breathe, and keep going. Make sure you have healthy ways of letting off steam.
Enjoy your job!

if you don’t know what’s in a drink and don’t wanna ask/can’t ask go check the register

Quit.