Should i quit my job if i am bad at it?

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I just got hired at a job i love! But i am totally, completely bad at it. I have kept trying to get better but, nothing seems to work. It's a client rep position. one of my boss's isn't happy and i really don't want to be fired. should i quit or wait until i get fired?

Thanks!

Should i quit my job if i am bad at it?