Where should I go??

Hi everyone, I'm vikky.
I have graduated from university for more than a year and now I'm working as a salesperson in an import and export corporation which located in a small country. I like the people here but I hate the working conditions. I haven't sold one a single steel pipe so what I did so far seems meaningless.
Actually I prefer to go to graduate school, to study in Beijing Foreign Studies University(BFSU),that's my dream, but it's difficult for me according to my level now, especially since I am working.
I feel sorry to this company if I resigned because I haven't creat made much profits for the company but I also don't want to put down my dream. I am also afraid if it is wasting time to prepare for graduate exams. I'm 23 now which is the age of a girl should to marry somebody in Chinese countries("culture" I think you mean)
So could someone give me some advices? Thanks!

Well... First of all. You should not worry too much about doing big sales/making big profits for your company. Personally, I think 23 is still very young. Making big sales or getting married is not something you can rush/control. You still have a bright future ahead of you, this is not your permenant job. You should continue following your dream. You can always find a better job once you finish graduate school. Its not a waste of time. I know its hard working and preparing for your graduate exams but all will pay off someday. Graduate school is just for one year right?

Hope that helps