Is it really that weird/uncommon to stay inside all day?

I am grown and live on my own. I stayed inside all day today but feel guilty about it. I just did it because it is really frigid here and I didn't want to risk frostbite. I just called my dad about thirty minutes ago and he asked m e what I have been doing all day and if I stayed in all day....I told him I stayed in, and he replied, "so you didn't go outside all day? That's kinda strange" . Is it really unusual , though? Even when the weather is ok, it is kinda unusual, right? lol I want to stay in more often when I am off..except maybe go for a walk.