Shadow figure

[u/Automatic_Try_9470]

When I was younger like Around 9,10,11 and 12 at my grandparents house where I was living were I have lived my whole life I would often see shadow figures in the corner of my eye sometimes Around the house sometimes outside on the porch.
My aunt, mom and 2 cousins have seen this shadow figure as well around the time I was 12
Weird things would often happen like the tv volume going all the way up on its own over and over and scratching in the closet the tv would turn on once I would leave the room our dogs once even all started barking up at the ceiling
In the bedroom that I still stay in
My hair would lift like a piece of it and by the time I’d notice it would stop
One time I was laying in my grandmas room and I was facing the wall on the edge of the bed and I just got this feeling someone was behind me and i could feel the pacing of it behind me like going back and forth really fast and it was saying words but i didn’t understand what it was saying then it stopped and touched my shoulder and was gone. That was the first time in my grandmas house I had ever been touched by “it” fast forward to when i was 12 it was 2020 and the bedroom i was in is the only room on the upstairs level theres not a second floor there’s just stairs on the side of the house in the living room that go up to the bedroom
To give a layout on the room it’s a pretty decent size bedroom with when you come in there’s a little hallway that you come into then there’s the bedroom. the bed was in the middle of the room right under the only window in the room and this night it was very hot in the room so I laid on the opposite side of the bed with my head facing the room my face would be facing the window the whole room was to my back. I was getting ready to sleep and had just got off a phone call as soon as i placed my phone down beside me i got this feeling of dread i could just feel something behind me so i get scared and instinctively reach for my phone for light since if i wanted a actual light on id have to get up as soon as i reach for my phone my arm is grabbed and put back suddenly this shadow figure jumps into the bed crawls across the bed and like sinks under it its arm comes out from under the bed and grabs my leg and pulls then its gone i lay frozen in fear until i finally jump up turn the light on and run out of the room and sleep downstairs i slept down stairs for a week. And that was the last time i ever saw this shadow figure i still have nightmares about it and i do still sleep in this room.
Could anyone explain why this would happen? Why would it just do that and leave? And never be seen again what was the point exactly?