Shadow People?

Ok, so this all started back in 2006. One day I was on my parents computer and I walked out of their room, and looked down the hallway. I saw a person who looked dark and shadowy. I told it that I would leave the computer on. I came back out of the hallway and no one was there. The next week a beloved teacher left and my favorite swim coach left. For the next couple of weeks I saw it. Finally it disapeered. Ever since I have seen blurry like object out of the corner of my eye, typically at the end of my hallway. During the fall/winter of 2007 I became very despressed, and was worrying about my mental state. I would lay awake at night and become very scared. Finally the depression ped and I haven't seen one of these "shadows" in quite some time. I will see blurs out of the corner of my eye from time to time, but I think it's my imagination. Do you think my house was haunted?