Fake facebook account of me?

[RAPTOR]

Too start this story off im not on facebook and never have been!
Today at school my friends told me that there was a facebook account of me with my correct location and school on it and as im not on facebook they know its not me and its fake.
Apparently the account was sending random people bad messages.
When i got home i told my mum about it just as something to say but now shes overreacted and called the police!
I was just wondering is she correct to call the police or is she overreacting?
Also apparently some of the people who recived the messages from the fake account think its actually me and apparently want to beat me up! Now im scared to go school:/
Any answers/advice would be appreciated