Well, there is a simple way all this can be explained. You are the survivng member of a twin fetis. In utera, your fetis absorbed that of your twin, who now lives like a parasite on your brain. At night while you sleep, it can gain control of your body, and it uses this new found freedom to mindlessly play CS:GO and L4D2.
Its so obvious. There is no other logical explaination, except perhaps for ..... ALIENS!
Shaftiel