Should I stay with my firm whose environment I no longer like?

Here’s the story: I work at a bank, in a country different from my own, which is kind of the reason I still feel like I have a lot of learning to do. At the same time, my group hired a bunch of new people whose attitudes / work habits I do not like (not necessarily bad personalities but just so hard to communicate or organize team work with).

I feel like it’s my responsibility to try to adjust to the change, but at the same time I’m really stressed out and not performing well. Should I try seeking out other opportunities or is it the grass is always greener on the other side effect and I should be humble staying with my current firm? Apologies for asking such a subjective question.