I'm seeing things and I'm worried?!

I'm seeing things and I'm worried?

I was in the shower this morning and I thought I saw a huge furry spider and I jumped and freaked out and then I looked again and it was gone. Also the other day I thought I saw my dad walk into a room, but it turned out he wasn't even home and nothing was in the room. Is this normal. I am 14 if that helps. Also I am a born again christian, I'm not on any drugs, and I'm not into tarrot cards or anything and I never have been. Also I have been sleeping with my bedroom light on for the past two days just in case I see something

Overactive imagination, maybe? I've thought I've seen something out of the corner of my eye once or twice, before too. You should ask your parents and go to your family doctor just to ask him what he/she thinks.