Hello. I am a 14 year old girl, and I believe that my house is haunted by someone or something. One day I was home alone downstairs on the computer. I was just sitting there and I heard a knocking. I knew it couldn't be either of my pets because they were sitting right in front of me in plain view, sleeping. And I also went upstairs to see if someone was at the door, no one was. It really freaked me out. Then it stopped and started again.
Previous to this, at night while I am in bed, I can hear someone or something walk back and forth in my hallway. I know it is not my pets because my dog sleeps upstairs and my cat sleeps with me, and my cat is normally sitting with me when I hear it. And also I will be home alone and be sitting on the couch upstairs reading and something walks up and down the stairs. I repeatedly look over the mantle at the stairs and I don't see anything. I have told my parents about this stuff and they just think I am joking around and they don't listen to what I say. I have studied all sorts of paranormal activities and I have come to the conclusion that my house may probably be haunted.
I also watch all the haunted shows on TV, i.e. Most Haunted and A Haunting. My mom thinks that it might be my imagination running wild. But I don't think so. What do you think and what should I do?