Shadow Figure, Why Is It Haunting Me?

When I was about 10 years old, I started noticing a shadow figure following me around. It is about 6' tall and thin with one yellow eye and one red. I always want to refer to it as him. I have no idea why but I always do.

I started seeing him after my grandfather had a heart attack and was sent to the hospital for treatment/recovery. When he was discharged, my grandmother and I went to pick him up and bring him home. When they brought him out on the wheel chair, I noticed the figure standing at the entrance of the hospital. It was center to the automatic doors, looking straight at me. I turned away because I was scared and did not know what was going on. When I looked back, it was gone. I didn't start seeing it again until I was 18 and out of high school. I just finished with the MEPS processing and signed my contract for the United States Navy. Shortly after, I met my girlfriend (now ex) through a close friend of mine. I won't say her real name (due to respect of her wishes) so I will call her Sarah.

One night, she told me her mother is dabbles in the Occult and she does so as well. I told her about the shadow figure and she seemed a little worried. She said it could signify a bad omen. Now at this point I am a little scared obviously, so she said she would talk to her mother about it. After I dropped her off, I went back home and went to bed. I woke up to use the bathroom at what I believe was 0330-0400 timeframe. When I walked in to the bathroom, I felt as if someone was watching me. I went to look in the mirror and saw it. It was standing behind me in the doorway. I felt an immense pressure throughout my body as well feelings of dread and anger. I couldn't move. Its eyes were the same but brighter, almost blinding. It took all the energy I had to turn around and face it. When I finally did, it was gone. I felt very weak and almost hollow, like everything inside me became cold and empty. I found enough strength to get back to my bed and I don't even remember passing out.

I woke the next afternoon around 1530. I felt more energized but still not 100%. My girlfriend at the time called me and asked if I wanted to come over. Her mother was at work and she was making dinner. I said yes but she could tell something was wrong and she was worried.

When I arrived, I sat on the couch and told her what happened. She looked puzzled and that's when she told me she talked to her mom. Her mother seemed worried and told Sarah to be very careful around me. She told her whatever it is, it seems very destructive and angry. Sarah told me one other thing, this is where I need all of your advice. She said that night, her mother went in to her den (place of practice) and stayed in there for about an hour. When she came out, Sarah asked her what she was doing. Her mother was very dismissive and told her not to worry about it. I asked her what time all that took place and I was a bit nervous with what she told me. Her mother entered her den a little after midnight and finished up after 1, a few hours before my visit with the shadow figure. With that in mind, we both became worried (me more than her by far). After that, every time I was around her mother I felt very uneasy.

I have had several more encounters with this shadow figure and I just want to know why it is haunting me? I will post more stories when I have the chance. Any help would be much appreciated.