6th Sense Or Just Coincidences?

I've had a few experiences over the years dating back to when I was a child. Never occurred to me, but my friend's mom one day said I might have the 6th sense. Creeped me out. Here are my experiences in a nutshell:

Kindergarten: I saw a female figure in traditional clothing standing at the top of the stairway at our home in the projects. She just stood there and stared at me until I left. I was too young to know anything then.

Elementary: We lived in sidexside duplex with my grandparents. I saw an elderly female sitting on the front steps while looking outside through the window at night. Some reason I use to love staring outside at night. The bedroom window was on top of the front door where she was sitting. I was only able to see the top of her head. I yelled a couple times for the figure to go inside thinking it was my great grandma. My aunt was in the same room as me, I told my aunt my great grandma was outside and it was dark. She only told me to tell her to go inside which I did numerous times. She finally got up and went inside. I ran downstairs to see why she was outside, only to find she was downstairs having dinner the whole time. Second experience at the same house, I saw my brother run upstairs. Followed him only to find both bedrooms were dark and empty and my brother was downstairs.

High school: at my aunt's house, on a sunny day outside gardening. My aunt asked me go get a bag from inside. No one was home but me and my aunt. While watching my own reflection on the screen door walking towards the door, I saw a transparent male figure walk from the hallway, to the door, looked at me than left to the kitchen. It was like the movie "predator" when the aliens go invisible. My aunt and her family has heard noises/footsteps, etc in the same house. They since have moved out.

Most recent: at my parents house, duplex also, waiting outside in my car at night for my sister. I saw her run down the stairs than vanished where it was dark at the foot of the stairs. My sister came out a few minutes after. I asked my husband who was sitting in the passenger side if he saw her, he didn't see anything. It was a solid black figure.

Sometimes I wonder if I'm just in the wrong place at the wrong time. It doesn't happen daily. It just freaks me out! I feel like I'm just waiting tense for the next time I see something again.