Two questions

I have been studying English formally for five months. Still when I talk with people use in English,I am used to describe things using some simple or familiar words to build a sentence. ,and I think it's a bad habit. Although I have remembered learned some new words on purpose, but between the conversations，all the new words just disappear from my mind，I just can not handled remember them.
and there is another question,I found find that when I talk with someone face to face,I can mainly understand what does he or she means,but when I see a movie or a teleplay,I am so easy to get easily into confused. Are there many differences between the real dialogues and the moive dialogues? Or is it just because my English is on a lower level? Can you guys give some suggestions or some solutions?thank you.

I think your difficulties are shared by all new language learners. I have the same problems with French, which I have just begun studying.

It certainly depends on the movie, but in general, I don't think there is much difference between real dialogue and conversations heard in a film. Good luck, keep the faith!