If you are feeling as if somebody is in your house right now, you need to stay calm. This feeling may be caused by variety of factors. It may be possible that you are afraid of being alone or you are more aware about everything around than it is required. You should never let these thoughts come into your mind. Try to be bold and more confident. But if you are still feeling in the same way, you should dial either to a nearby police station or to one of your neighbours.