My first job was office worker in big company, but it didn't suit me. My first job was an office worker in a big company, but it didn't suit me. / I was originally an office worker for a big company but it did not suit me.

There was sexual discrimination between my family.

It was common sense of value at that time. It was very common at that time.
However, I didn't know that it even existed even in workplace. However, I didn't know that it also existed in workplace. / However, I didn't know that it existed even in the workplace.

 It's so terrible. So I decided to change my career.