Suicidal thoughts

I hear voices telling me to kill myself and they wont go away. They tell me that I am worth nothing and there is no point in me being alive as I’m just a waste of space. The problem is that I agree with them and I am plagued with thoughts of ending my life. Yesterday I found myself with a kitchen knife against my wrist and I tried so hard to resist the urge to slit it and end it all. I still have the marks from where I pressed it hard against my skin which remind me of how close I get to the edge.