Strange 6th sense, would be nice to know what this is?

You are probably empathic. Lots of people 'feel' their atmosphere and environment. I am extremely sensitive this way. One time I worked at a hospital but had to quit because I could feel the misery of those around me. It can be quite a burden. I read people instantly and find it a distraction some times. You don't say how old you are, but if you are a teen, this ability will increase as you get older. What you feel in a house may not just be dead spirits, it would be negative 'energy'. The 'mood' of those who dwell in a house sort of sticks to the walls. As you get older, you will be able to distinguish what exactly you are feeling. Surround yourself with upbeat people and happiness or else you might get sucked dry. It's happened to me a couple of times. Please be careful. Good Luck and God Bless You.