You can't fail at learning a language. The number of words you need to know to get to your goal is not infinite, so the only way you can really fail is by giving up.
You'll get there! Just make sure that you know today something more than you did yesterday.
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I don't know, I'm really bad on/in english language.
I speak: Catalan, Spanish, Italian and French.(I know, all romance languages)
But I can't understand these people talking.