Wilson looks so much like my Riley, except black and white instead of orange and white. And coincidentally Riley also is scared of the outdoors but that is because he lived outside before he was caught by animal control people and put in a cage in a room where he saw many animals getting euthanized (and he was next, but we saved him). Maybe your cat had a rough life outside and that is why he is content remaining indoors - he knows the dangers out there.