How long to stay at first job before moving on?

As some of you know I’ve been having issues with work. I’ve been here 6 months. Every time I feel like things are going great, something horrible always comes up.

I had a new hire that had issues scheduling training. I informed my supervisor and she said she would take care of it. She then told me that upper management didn’t want to continue with her and to tell her to apply for another position in two months. So I did what my supervisor told me to do.

I got called in the office and in trouble for firing this person. I explained my side that managers and supervisors gave me orders but I got the blame. He said I should’ve questioned it, I should’ve felt it wasn’t right, I should’ve came to him, etc. because apparently only he and president can do the firing. I felt like I was getting all the blame.

This is just one incident. I’m so freaking tired of this I just wanna quit!!! I always begin to like it but when I do something comes crashing down on me.

Before he told me not to question authority but now he is telling me to!?