I have been experiencing many of these things my entire life, but have recently become curious about/fed up with some of what has been going on. My entire life I have been terribly, terribly afraid of the dark. I have never had a traumatic experience in the dark nor do I have anxiety problems. The second I turn off the light, I feel like someone is standing right behind me/sitting next to me. I have attempted to reason my way out of the fear but it isn't my imagination that is frightening, its the fact that I perceive a presence in the room. This has followed me throughout every room I have inhabited/stayed in, and when staying in very old houses I most often don't sleep if I am alone in the room. My grandmother passed 8 years ago and I still sporadically smell her perfume and other random smells when other people do not smell them.
A couple years ago, I started seeing black shadows in certain places. They look like seeing a person's silhouette out of the corner of your eye but aren't there when you really look at them. I have been evaluated and assured that these are not real visual hallucinations or a symptom of a mental disorder, just my mind playing tricks on me. However, this does not stop the feeling that someone is there. I bought a used car a few years ago and a couple of times have seen (I say seen but it is hard to explain how I really experienced it) a young woman sitting in a specific seat in the back seat of my car. I can describe exactly what she looks like and she feels like a normal person. She doesn't feel scary or even alarming but logically it is strange that I experience her being there. I just wonder what these experiences mean and if it is just my mind playing tricks on me or something more. I have not considered this being meaningful but recently heard a medium describe her experiences before focusing on her talent and it really struck a chord with me as similar to my life.