He watches as I sleep.

Number one rule

NEVER fear them! or else you are feeding the fire the fuel it needs!

This is a little update .
First is thing is that I don't know what is a creepypasta until one user gave me the link. And the creature I saw does not fit the description of the slender man , except for the height I suppose. And I'm not a fan of all things horror , because I get frightened easily.

Second is that I did what a commenter told me to do , I visited the old lady. The Old Lady kept asking me whether I had trespassed 'Her Land' or not , I answered no because I really didn't . She said she advise me to not sleep in my room for one night and leave a bowl of cow blood and a plate of cow meat in front of my bed. I did as she said and slept with my sister last night. I made sure to lock our bedroom door before dozing off. I went to check my room this morning and the bowl was gone , along with the meat. I didn't see the Old Lady today , but I'm going to pay her a visit later.

You said it truly in your third sentence,"I frighten easily". That is probably the truth!

I'm glad I could help you, your story is interesting that's for sure. Sometimes it's useful to make comparisons which helps narrow things down, as one user said it could be a Djin. But in any case I truly hope your situation is resolved soon.

shadow person no one knows who they are but I believe there spirits they become more friequent in sightings. Ive seen one once and the descriptions match. look up shadow people