When it seems that you have not learned anything?

Really, in some moments seems that I have not learned anything.
This happen when I am trying hear a america's music, movies or tv's seríes and I don't understand any word.

To be honest, sometimes this make me want to give up.
But, I remember that I studied a lot to learn what I know now. It seems few, but is many important don't forget and to value it.

Is very important to study teaching materials that are in your learning's nivel.
I believe that can help, when to give up seems be better than to study.

Junio Oliveira