A few years ago when I first moved to my current city, something really weird happened. My parents were at work, and I was walking around outside, trying to get used to the new neighborhood.
I was making my way back home and my house came into view. The front door was wide open, and I know for a fact I had shut it. I walked up close to my house and peeked through the window, and I saw someone sitting on my couch. Getting scared, I backed away from the window and got my phone out of my pocket, then I heard the front door shut.
I looked back to the window and the person on my couch was gone. I walked up to the door and opened it, looking around inside the house to check for a sign of someone being there. I didn't see anything so I shut the door and called my mother, who said she would be home soon and to wait outside. When my mom came back we searched the house and found no trace of anyone being there.
As I lay in bed that night, I was doing some serious thinking about what had happened. I was trying to come up with an explanation for it but I couldn't. As I was finally drifting off to sleep, I started to feel like someone was staring at me. I opened my eyes and I saw a really dark figure, huddled in the corner of my room. I screamed and turned my light on and the figure was gone. My dad came running into my room asking what happened, and he said it was just my imagination. I knew I was not imagining that, I knew that was what I saw on the couch earlier. No one believes my story to this day.
But without offending you, it is always better to rule out rational thinking and explanations before foraying into paranormal. That was what NorthCoastie, Dark0nix and others have tried to explain. Even they don't have the intention to demean your narrative.
However, I would like to ask you some questions. Except this incident, do you have any further development or sighting or hearing things in your house. What was the reaction of your mother to your experiences and did she have any experiences on her own. Why don't you try to investigate about the house itself, ask your neighbours if they had any such experiences or encounters. That could give you more light into your experience. Keep a diary of events, if they happen regularly. Please post it in this forum. Perhaps we might help.
But with only one experience, it is difficult to say anything further.
Regards and respects to you.
SDS