Kate,
I suggest finding a hobby or a activity you enjoy to take your mind off cutting. [I am a cutter, too, so I know what I'm talking about]. I had a disruptive childhood as well. My parents separated 7 years ago. I began cutting when I was 12 because I couldn't handle the stress anymore.
Here are some things that I've found that help:
1. Painting, sculpting, drawing...art of any kind
2. Going on a walk
3. Taking a relaxing bath (make sure there aren't any razors in the bathroom!
4. Talking to someone who DOESN'T know about the cutting...because you have you hid it from them, and that takes your mind off things.
5. Reading a book
6. Swimming or any strenuous activity
7. Playing a musical instrument
8. Writing in a diary or journal
9. Splashing COLD water on your face for 10 seconds at a time
10. Listening to relaxing music
Hope this helps! Message me and we can talk!