Should I resign?

I was promoted from my job after one month. Some people are not happy and cannot expect that I will get promoted.

I did my best in the position, even if at some points I made some mistakes because I am still learning However, in some unfortunate event, I was demoted from level 2 to level 1. It is kind of embarrassing for me because some of those in level 1 are insecure about me, so for sure they will mock me. And, I don't understand why the management did this, but according to them, it's because of performance.

I am depressed right now. Should I just resign?

Should I resign?
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