To stay or to leave?

Of course the most practical way is to work and wait until you find a new job BUT...

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if you are really unhappy and cannot even stand a single minute of your life in the work environment, just quit.

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Mental health is sometimes overlooked and then your health will suffer.

Seems like you don't like the job scope AND your fellow colleague (only one?).

Imo, the former is a major push factor since you are young (with aspiring career growth i presume).

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If your company allow for job switch, try to see if there's any opportunity for internal transfer for a change in job scope.

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Meanwhile, I also agree with only quitting after you secure a new job. Don't have to put in 100% effort for the 100% pay thou (ok, an evil advice here) :p just do your job alright & no need perfect so that no one can use it against you in any future.

Also, don't ever burn bridge.

Seems like a minor issue to stay till you can find a job. The truth is, you can't always choose who you wanna work with. And if you don't find ways to work around that, you might find yourself changing job EVERYTIME you have a colleague that is not on the same frequency as you.

1. if you're unhappy with your job scope then why did you accept the job offer in the first place ? u need to know your answer to this question
2. every job will have someone who will clash with you. if you change this job just because of one person, its really not worth It. Unless you're saying the whole team is against you, then you should consider leaving. if it is just one person, and you like the job or find it meaningful, then u can wait out. things may change along the way :)