Dream meaning of being afraid to look in a mirror?

[littlestones]

Ive had a dream and I know it means something important but I can't figure it out. In my dream I was at an old house and there were lots of strange objects, there was a long mirror against a wall. I was afraid of the mirror and the person beside me(I couldn't see them) told me that it could be dangerous if I looked in it.
Any idea what this dream could mean?
Any help much appreciated