system
Given the following post, respond as if you're commenting on Reddit:
human
Got a call from a prof about how unhappy he was with my performance...how screwed am I?

I got a call the other day from a prof that I TA for telling me about how upset he was at my performance as his TA. This is my first year in grad school and I freely admit that I have made quite a few mistakes as his TA. How screwed am I? Should I prepare to master out? Should I voluntarily withdraw?
gpt
Whoa, whoa, whoa. You're majorly jumping the gun. Your prof shouldn't have handled it like this over a call but what's done is done. 

Ideally, he should be looking to give you feedback with the expectation you'll improve and then come back to review. 

You need to meet with him and hear him out. Do not say anything about quitting or failing, you'll just be making it worse and putting words in his mouth. Let him do the talking, and try not to hear the worst possible interpretation of what he's saying and also don't take it as an assessment of you as a person. We all screw up at some point, the key is being open to the feedback and willing and able to change. 

Assuming there hasn't been a discussion before this about your overall performance (as opposed to occasionally pointing out a mistake), this should be an opportunity to assess the overall situation and make a plan for improvement. If there has already been a discussion then this is more serious.

Don't quit without at least getting a clear understanding of the situation, and if they're happy for you to continue don't beat yourself up and convince yourself you should leave.