The two things are not mutually exclusive. I have it on good authority that many people read books and watch TV shows or movies as well as getting out of the house.
Speaking from my own experience, I was a shy youth who found it very difficult to understand why my peers did things, or behaved in the way they behaved. They were often like aliens to me. They could understand social nuances that I could not. They could run up to a ball and kick it and it would go the way they wanted it to go. When I tried that I would miss it, or it would go somewhere else and I would be made to feel useless and small. My escape was books. I was a voracious reader of science fiction and fantasy. These worlds I could imagine and understand. I loved the idea of going into space, or going on a quest. My TV viewing was similar - I loved the shows that were magical or technological - Knight Rider, Battlestar Galactica - and where the good guys usually won.
Eventually my dad bought me a BBC B and I learned about programming and started playing games like Elite where you could explore 8 different galaxies engaging in trade and combat. At the same time, I also started to learn that quite often other people were afraid of things that didn't bother me at all. I could speak in front of people and I enjoyed taking on a character and performing it. I became involved in Amdram, went to University and studied music and drama, then a post-grad in classical acting. I loved the idea of being on stage because I could be someone who wasn't me. I also had friends who were into live role playing - again a chance to be someone or something else. To change character and explore new worlds in a different way.
People tend to be very negative toward video games, and to be sure, there are both positives and negatives. This is actually one of the themes that Grand Theft Auto explores a lot. It's a horrible violent world in many ways and a couple of scenes (particularly the controversial torture scene) are very difficult indeed to participate in, but it's also extremely clever and often laugh out loud funny - whether it's taking swipes at conservative America or rednecks, or just waking up as Trevor and wondering why he is now wearing ladies underwear and surrounded by some very dead looking people (Trevor's character is a sociopathic psychopath who can fly planes).
Personally I prefer Red Dead and the Last of Us to GTA. Both of them are not about killing people. They are about survival, hope and learning to make the most of your environment. They engage your emotions just like any good movie or good book will do. That doesn't mean that I don't enjoy my family, holidays, going on bike rides, driving single seater race cars or any of the other things I do. Oh - and I still read a lot of books.