Personally I find that when I make mistakes it can be really easy to fall into a negative spiral that leads to me making more mistakes. One thing that helped me change my mindsets is ghat I don't look at my mistakes as mistakes anymore. They become learning opportunities.
Let's say for example you ring a customer and forget to ask/or put in they're drink as iced. Barista makes it hot customer then tells barista they wanted ice. Instead of latching on to all the negativity of how you messed up instead focus on what you could have done differently.
To continue with the same example you realize that they never specified and you forgot to ask them. So for future orders you know to always ask ice or hot unless it's obvious (like a Frappuccino). Always read back a customers order to them as well. Especially if it's a more complicated order.
It helps to remember when you take a customers order you are a liason between the company and the customer. It is very rare that a customer is bothered by clarifying questions. If they are that's on them. You are doing nothing wrong to ensure that you are getting their order correct.
There is absolutely no reason to take anything personal. I honestly could go on but this is already getting too long. If you feel like looking up a self help book I cannot recommend the four agreements enough. It's a very short read and is really eye opening (at least for me). I think you could even find the pdf online.
$1Good luck to you and remember that your partners are a resource too. Ask them to help when you need it. If you are showing effort to learn from your mistakes people tend to be much more forgiving.