Maybe you are a little introverted. Some people are just like you, only to realise they love being alone and doing their stuff in a pleasurable way. I also don't have a problem staying for days inside once I have everything provided. People in my area always ask if I travelled because they don't see me for days around. And I am always at home.

And also, I do some abnormal stuff indoors which would make me crack up with laughter 😃 you know, like running around aimlessly in the room or holding the iron handle on my window and start twisting like a snake 🤣🤣 there are lots of them I just do - that's a way of making myself happy and clearing my mood from loneliness.