Grammar is rather difficult for me. When we chat or talk to English native speakers, we don't care grammar that much. The only way to access grammar is reading text books but it's boring. Do you have any other methods to learn grammar, MeMe?
Grammar isn't difficult. You can speak in your language without knowing every grammar rule. For example: when you come home late because the bus stopped somewhere or because you were in a meeting you probably don't know that this is a "Oração subordinada Adverbial Causal", do you? So, all you need is to pay attention for the use of and the structure itself for you to bring those ideas into your life.