Is it okay to leave a job after a year ?

I have worked at a very big company, but i do not enjoy my work and the work hours sometimes extends to 12hrs a day. Also there is whole lot of office politics , way too much which i am not good at. I am a designer and I have done my masters in Fashion already, but I have gotten through UAL in London , which is... show more I have worked at a very big company, but i do not enjoy my work and the work hours sometimes extends to 12hrs a day. Also there is whole lot of office politics , way too much which i am not good at. I am a designer and I have done my masters in Fashion already, but I have gotten through UAL in London , which is very prestigious. I am an overthinker and I hope i am not making a mistake but i am very excited to learn about textiles (previously I had done Fashion design). Its a different stream but very much related to my work. I would really appreciate some advice, I cant turn back my resignation now, this is anxiety so please help me out.
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