Help! My cat is scared of everything

Help! My cat is scared of everything

I got a cat last year when he was 6weeks old.He was born inside and had never been outside. He is so scared of everything, all he does is hide! He has very pale blue eyes, and is a short-haired solid white cat. His eyes are very sensitive, and they bug him a lot... He is always under the bed, in a room that is never used. Does he hide because light hurts his eyes?? .. But.. I've tried shutting the doors to the rooms he hides in, and he lays in the floor, but when someone moves or gets up it scares him to death and he runs under the couch, why is he so scared, and how can I help him?!?! The only time he comes to me is at night, and he wants to be right on top of me, ALL NIGHT! .. I just don't understand him Please someone help!