Am I being followed by a ghost / spirit / thing?
I'm now 28 and still experiencing the same phenomenon that I did as a child. I have continuously been followed by what I can best describe as a dark figure that likes to play tricks. 'It' or 'they' have followed me from my childhood home, to university to where I reside today with my partner. I would have booked myself an appointment with a psychiatrist long before now if it wasn't for the fact that others have experience the same phenomenon in my presence. Typically the entity is viewed by myself, family and friends as a shadow that is seen passing along the landing or hallway. On other occasions we experience a presence that is watching us or we feel like someone is behind us, only to find that no one is there. One of its favourite tricks is to bang on the ceiling whilst we are trying to sleep. All these occurrences have happened as a group and individually however one factor remains the same, these events only appear to happen when I'm around. My mum even asks if I'm bringing Mary (the name she has given to the entity) when I come to visit. On the whole these events are light hearted and we joke about it, there are only a few occasions when I have felt scared or threatened but these events may not be linked.
Being an atheist who has devoted much of my life to the field of science it sounds absurd to hear myself asking 'am I being followed by a ghost?' Could this instead be some kind of mass psychosis or psychic projection where I'm somehow altering the perception of others? Any help would be appreciated.