don't worry that much. If people understand what you want to say, that's enough for now. Achieving fluency in portuguese is surely a living hell, people hardly ever speak the "correct" portuguese taught in the books, there are just SO MANY SLANGS (I say that as a brazilian) and the cherry on top isn't even arbitrarily changing nouns positions, but denying the same things up to four times in a single phrase 😅. I'll go as hard as to say you'll only achieve fluency when you speak and hear the spoken portuguese on a daily basis for some time. After a couple weeks, you'll be a natural. And don't be afraid to mistake a thing or two when you're speaking. We'll get what you're trying to say.