I should have to (or: need to) progress my spoken English

In This morning, I had an interview in at a group company [集團? then it is "a corporation" or sometimes "an organization", but usually, "a company" is sufficient]. Two pretty ladies had the interview with us me._They all spoke English, very fluently. However,_and I my English (or: mine) was so terrible. I can could not (or: I was not able to) express myself, and the interviewer said that although I am just a very friendly person, I may can not be suitable for an good export business representative (or: agent).
So, I think I need to progress my English._I need a work (better with: job / [working] position, since "work" is generally used as a verb). I need to earn money to go on (or: to continue) the living.

N.B.
1) The subject pronoun "I" is ALWAYS capitalized.
2) In English, the name of languages is capitalized on the first letter, e.g., English, Chinese, Korean, Japanese, German, etc.
3) A space is needed after most punctuation marks (except an opening quotation mark or an opening bracket), such as a comma, a full-stop, a (semi-)colon, a question mark, an exclamation mark.

敬請繼續努力。/ Please keep up the good work.
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Good day.  /  祝  是日安好。