When walking into something like a waiting room of your doctor, do you say hello to the people there?

I'm asking because it's a very normal thing to do here.

When you enter a room, but also things like a hairdresser or say a small cafe, you say hello to the people there and say goodbye when leaving. Or when taking a bus, you say hello to the driver and goodbye or thank him when getting off.

I was only recently told by some online friends of mine that this is pretty weird in other places. So I'm wondering if I'm (or my country) is the weird one or them