Am I Schizophrenic?

I'm starting to have these doubts... I've been hearing strange things lately, like scratching and banging on my bedroom door. No one else in the house seems to hear them but I'm sure that the sounds are real! People keep on telling me, "You're imagining things." And now I really am starting to think I am. I thought I even heard my dog speaking to me one night and I realized I was having a conversation with my dead dog. No. Not an actual conversation. More like, 'I have a feeling someone is saying this'. And I would have a feeling that the ghost of my dog is standing right next to my bath tub. I even started petting the air. Then started crying while saying, 'I miss you' ' Why'd you leave' 'I forgive you'. And now that I think back on it, isn't that what crazy people do? But I'm not crazy! I don't think I am at least. I'm a normal middle scholar who has many friends. I think. And after I said "I forgive you" to what I thought was my dog's ghost, I haven't heard a scratching on my door since. Now before anyone says 'Oh, it's probably your brother or parents scratching and banging on your door', be realistic-- Or, don't be realistic. The first time I heard a tapping on my door (It was irregular) I immediately opened the door, no one was there. I was running around the house asking if anyone did that because for some reason I was just very paranoid about it. I went back to my room and didn't hear it again that night. A couple nights (Or the next night, I don't remember) I then heard a banging on my door, which for some reason had reminded me of my dead dog Lily who we put down for biting and piercing my lip, though I was pretty sure it was an accident on Lily's part. It reminded me of Lily's tail thumping against the door or wall. The next night, I heard a scratching on my door, which Lily did whenever she wanted to get in my room. I had looked under the door and there had been no one there. I was starting to get extremely paranoid and so I ran to my parents room and told them. They dismissed it as my imagination. What if it really was my imagination? Thought I still think I genuinely heard it! What's going on? Anyone have an idea or explanation? I'm scared.