Recently, I've been feeling especially anxious when I go outdoors, like at the mall. I'm quite an anxious guy, but It's weird because I usually never get anxious outside. I have a theory that because I've been indoors for so long due to quarantine, that I've become accustomed to this lazy, indoor lifestyle. So when I go outdoors, I feel anxious because I'm used to said lifestyle. But I'm not sure. What could be the cause? And What could I do about it? Could I just go outside more and get accustomed to the outdoors again, so I don't get anxious?