Help me with this horrible dream i keep having!?

Ok im 13 year old girl + This is a bit long but here goes –

I was at my Nannas house but My nanna wasnt there, and it was about 8:00 pm and my parents were up stares fixing something I think. So I sat down to watch the TV and Billie piper was there in character, and she came on this scary show. It was dark and around midnight and she had an axe. Her boyfreind was there and his mum aswel. There was a baby in like a round tub thing with baby toys in it.
Billie started saying stuff like erm “come dont wanna get hurt”
i cant really remeber. Anyway shes saying stuff and the man grabbs the axe and starts chopping her up. You see the man chopping but not the body. You hear horrible screaming and grugling and weird noises, then it focuses and the baby and it just like loads of baked potatoes where the baby should be, all mixed around. It was supposed to be the dead baby + the Boyfreinds mum said “oh looks like potato”
+ the dream ended!

What can this dream mean? Its really scary :[

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