My last failed job interview

I have to say that my last job interview was a total failure.  It's really frustrating because the English language is a requirement for to apply to the working world. I'm a publicist and in this moment I'm studying advertising (This is accurate, but it sounds more natural to say I'm studying advertising right now). And I feel that I need to learn in record time, but I can't speak the language very well because I don't (be careful to use an apostrophe ' instead of a backtick ` for contractions and possessives)  have the opportunity. So during my last job interview, I had a mental block when it was time to talk, and this mental block was my failure.

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It seems like your English is quite good from this post.  I know mental blocks can be extremely frustrating, but don't let it get you down.  Instead, use it as motivation to keep improving and I'm sure you'll do better next time!