Completely normal. I don't leave unless I'm going shopping or out randomly with a friend... inside I have a TV, PS3, Netflix, computer, internet, books, food, water, soda pop. Outside it's cold, inside I have heat.
I have not left my house in a week but I have to open the blinds and I still step outside with the dogs. Not opening the blinds and staying in the dark are signs of depression. Go see your doctor and make sure you don't have a medical reason, if there isn't a medical one he/she can refer you to someone who can help.
Depends on the weather here in El Paso! When it floods ( yes, in the desert it sometimes floods and washes out streets!) or snows and ices over ( yes, sometimes the North wind doth' blow and we do get snow) it's best to stay in because people don't know how to drive in bad weather and the wrecker and ambulance companies have more work than they can handle! I stay in, watch tv, read, and do ask! And come out of hibernation as soon as its over!