I can understand what you're concerned about, and I think I would be trying to do what you are now, and quitting now! The hardest part is always asking for help, and you have done that now. So, we can make a start.
It's like someone who used to smoke cigarettes. You get into a habit of doing it, and you can't help it. A certain situation comes along and you light one up, and it's the same with cutting. You get into a certain mood or something happens, and you instinnctively think about cutting.
Well you need to break the cycle.
We can only give you some advice and some past experiences but you need better help than this.
You need to get to the Dr's and they will refer you for councilling. It's not good, as it hurts at first to talk about things, but it will help in the long run, I promise.
They will look at why you do this and if there's ways of getting you away from that and maybe focussed on something else.
Above all, I'm sure you have friends who support you. I am here if you need to talk.
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I will pick myself up, Dust myself off
And leave all this sadness behind
I'll be fine, I won't be blue...