Meh, I don't believe in ghosts.
When I'm home alone, it's all quite and I hear noises that I don't normally hear. The first time I was home alone, I heard the ticking of the kitchen clock for the first time. I freaked out, and thought that someone had snuck in and stuck a bomb in my house!! It was all in my head, though. Thank goodness. *breathes sigh of relief*
I dunno what to tell you. I've never been put in a situation like that before. If your parents don't believe you, try talking to a school guidance counselor or a family physition (sp?).
I hope things get better!
~CP