Is it normal that i feel chased when i am alone?

okay so, as far as I remember myself I've always been so freaking afraid of being left alone.
I always have this image inside of my mind that '' theres something near me, its scary be on alert ''

I get so scared and panic and I sprint through the house at night when I want to get watered I turn on all of the light, and I keep looking around there isn't anyone that I don't know there :\
sometimes I would cry and turn around non stop. I am getting over it very slowly... it was hard to even shower or sleep alone :\ now it still a bit scary but I manage.

I never had any trauma in the past, is there someone like this too :\
thanks hope u have a good day...
(btw sorry if I had any grammatical mistakes, English isn't my first language )