Voices And Shadows

I am trying to understand what is happening to me. Since I was in the 10th grade, I have been hearing voices and seeing shadows. I also see these little bright lights that will last for a few minutes then disappear. But lately I have been seeing more of these shadows, and I feel threatened by them. I can feel the mood in the room change when I see them. I sometimes feel like I'm being watched. I feel on edge and uneasy. Sometimes when I sleep things happen. For example, one night I woke up because I heard a noise in my room. I sat up, and when I looked at the edge of my bed there was an indentation in it. As if someone was sitting there. Then the indentation rose up. I used to hear my name being called out to me a lot in my teen years. That would scare me because the voice would start off low, and when I wouldn't pay attention to it, it would get louder. It would only stop if I were to look around the room to see where it came from. Just recently I was sleeping, it was about six thirty in the morning. I was awakened by a strange noise in my room. I like sleeping under the covers, so I began to pull my sheets off my head. As I was doing this I stopped because I could see this large shadow being cast on the wall behind my bed. It was moving, and I could tell this thing casting the shadow was at the foot of my bed. It scared me really bad, not because of the size of the shadow, but because of the noise it was making. I can only describe it as a crackling noise, with a low rumble. I'm not sure why this is happening to me (as a side note I guess I should mention that in the beginning of my 10th grade year of high school, I tried committing suicide). I'm not sure if that has anything to do with what's going on. I live with my grandparents, and their house has always been haunted. I don't know if these spirits don't like me, or what is really going on. If anyone can give me advice on what to do, I would really appreciate it.