Am I better off leaving the job?

I’ve been having problems at work where I’m constantly being made fun of and harassed. I kinda slouch a little and people would mock me saying “My back hurt!” almost everyday.

Mind you, I have no issues with my back hurting at all, I do have slight discomfort on my left shoulder since I use it more than my other arm.

And it’s obvious that they’re doing it towards me cause they’ll say it and then look at me to see if I’ll react. I told someone what’s been going on because at that point it’s harassment since it’s been going on everyday now.

And I also don’t get why it’s happening because I’m always told I’m such a good worker and blah blah blah, yet they’re the same people joking about me.

And I know I’m a good worker. I don’t go around spreading gossip, or starting stuff with people. I will be going to the manager about it as well but if things don’t get solved then they’ll lose their “good worker”.
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I also wanna try to find another job before leaving this one so I’m not unemployed struggling to look elsewhere. I’m trying to hang on but ignoring what’s been going on doesn’t work
Am I better off leaving the job?
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