It sounds as if you are having an unpleasant time at work. I think this link could help you find out where you need to go and how to find time for yourself each day even at work. Hopefully your work days will brighten 🙂
You wrote, “I want to change my career but I don’t want to”. There are pros and cons to your job. One pro is that they deposit your salary on time. One con is that you hate a core worker. I wonder if there is a way to resolve the unpleasantness with the co worker, is there, do you think?
i do have a way to resolve this issue with my coworker, i have raised my concern with our Senior but as per my Senior, he told me that i need to understand our coworker because it is part of his personality.. and i am working with that. 🙂