what do dreams really mean?

Last night I had a dream that I really don't want to admit to. Not because it's nasty or anything. But because I don't like that I dreamt about it. I had a dream that my grandma died. She was in the hospital last week, so that was obviously on my mind. But I still don't like that I had a dream about it. Weird that we had watched Nightmare on Elm St that is all about dreams and then I had a dream about death. In my dream I don't know how she died, but it wasn't tragic or anything. I know that my dad will be upset reading about this, but I wanted to put it out there just so that I would not feel so bad about my dream.