How do you deal with feedback/criticism at work?

Ive been at my job for 3 months now and all of us new folks all agree we dis NOT get enough training for the high level of things we are dealing with. I have brought this up with my manager professionally as well and nothing has been done, just a “well this is how it goes” attitude really.

My manager recently gave me feedback about an upset customer writing a bad review and cancelling with us (other reasons). I interacted with this upset customer, escalated it as I was told to, and then was not told I was supposed to follow up as I was under the impression my manager would.

She said its a learning opportunity, and I understand, but I also let her know I needed more direction at the time as I was like 3 weeks in and I, as well as others, have told them we dont know enough here yet to be dealing with such high level accounts.

Anyways, Im really beating myself up over this incident. Like, really bad. I know everyone makes mistakes etc and Im still new, but how do you deal with these types of things and has it happened to you?

I’m so scared I’ll be fired or something, even though I doubt it based on the conversation.