I know right now it seems wicked hard to try. But you have to keep trying. You will fail sometimes, its reality. But you need to try. Make a goal maybe. You made it 9 days this time, starting tonight or tomorrow, try for 10 or 11 days. Then when you reach that goal, reward yourself somehow, then keep trying. Then maybe keep progressing up from there.
Try and keep yourself distracted as much as possible. Go for walks whenver possible, draw, write poetry, a song, a story...whatever you like more.
Just know that you arent the only one struggling so hard. I know I'm kind of young [17] but, trust me, I know how it feels. If you need someone to distract you sometime youre really thinking about cutting, pm me if you'd like. I could try and help.