Amber,
you can go to a community hospital or a mental health center and tell them you want to hurt yourself. They can help you from there. Just explain your situation about your parent to them and they will take it from there. In the state where i'm from it is the parents responsiblities to take action when a child reaches out as you are doing and they can get in trouble for not doing so. But if the parent decides not to help their child then the state can take over.
I wish you all the luck. Please stop cutting yourself. I take care of several people who cut themselfs for the same reason and it does them no good at all, but leave horrible scars and memories. Talking about your problems, writing about it in your journal, using art such as drawing, painting, poetry, writing songs, writing letters to those who hurt you and then tearing them up will help get a lot of your pain out. I know i've done it. I still use those tools. Try them. They work.
Best of wishes,
pebbles