Nicole - Since you were tiny you have been fed information that the Devil is evil and can harm you - this by parents, the church, from films and TV. I myself was taught such things and had a terrible time growing beyond them. So, what happened to you at 10 years old that started such dreams? Maybe someone said something to you or you had an experience.
I take it you have read the entry Devil -
http://dreamhawk.com/dream-dictionary/devil/ but you also need to read
http://dreamhawk.com/dream-encyclopedia/archetype-of-the-devil/But another explanation of the Devil can be found in
http://dreamhawk.com/inner-life/secret-of-time-and-satan/But if you can do it the best thing to do is to use
http://dreamhawk.com/dream-encyclopedia/acting-on-your-dream/#BeingPerson. The devil in your dream is not like real life, because a dream is nothing like outer life where things could hurt you, but is an image like on a cinema screen that even if a gun is pointed at you and fired it can do no damage – except if you run in fear. So all the things that scare you are simply your own fears projected onto the screen of your sleeping mind.
It is also important to realise that every image, every scary or terrifying thing, is taken place inside you, in your mind, as you sleep. This means that every awful animal, every scary thing or person, is created out of your own fears and must not be seen as outside you as happens in waking awareness. The problem is that we are often scared of or frightened of actually experiencing our emotions and so they confront us in our dreams. Avoiding them or controlling them is like running away from oneself – there is no escape.
So being the person or thing will make a big change.
Tony