If it's any consolation, I used to be just the same, and still am in my own language learning endeavours. I've always had a feel for languages, but was never too familiar with - or interested in - the actual grammar.
Then, somehow, I ended up here... and now I explain grammar all day long. Fortunately, Google's got my back.
Things just start sounding right after a while, as long as you read/listen enough to the language to build a proper foundation - a foundation you're still building up in the case of Norwegian.
I wish it were just "time to time"! LOL This is my first time trying to learn a new language (at almost 50) and, while I'm known for my language skills here, I can't tell you WHY something is supposed to be the way it is, and I can't remember all the names of the types of speech and grammatical terms, but I can tell you if something is wrong or right! I was affectionately called "Grammar Nazi" at my last job. LOL People always had me proofread their stuff and correct it. It's incredibly frustrating to me to have such trouble now. Though, I started reading when I was three, so I've had tons of time with my own language and only just over a year with Norsk.