You don't need a car in Oslo though. Provided you weren't planning on going there by car. In fact bringing a car to Oslo is mostly just bringing yourself more trouble. It's not a big city so you can get to almost "anywhere" in Oslo by foot. Or you can take the bus or the tram or the subway, depending on where you are going. Whereas with a car you will struggle to find parking and there are multiple one-way streets in the very center. And also there are toll stations if you go across the boundary between the outer parts of the city and the rest of the world outside of it.

That being said, I don't know you so of course I don't known how important cars and driving is to you. But in general I would recommend not bringing a car to Oslo unless you have a good reason to bring it. Even if you have a lot of luggage you should have no significant problem transporting it on the train from the airport outside of Oslo on the train and then bring it to the hotel or wherever you are staying by jumping on to a bus for example.

Thinking in terms of 'I' is part of the problem.

That’s ok. You can go elsewhere.