So sad to hear how down you are feeling. I can understand the urge to want to try to hurt yourself it can really get very desperate cant it.
You say you already cut and wish something deeper and closer to suicide. Cutting your wrists will be incredibly painful and traumatic it needs to be done in a certain way and what we see in films and that is just way too simple and so far from realism. I think along the same lines as @charlottewilts in that it may help to share with us (if you feel comfortable doing so) what is making you suicidal. I used to self harm by cutting but I stopped as I couldn't work out why I was causing myself even more heartache and pain, by cutting at my arms I was hurting my poor body evenmore I figured I didn't deserve that. I try and be kinder to myself, however hard it is. I found the more i cut the more I wanted to do so and had to stop it. For me I clench my fists really tight for as long as I can, to take edge off things a little and the ice and rubber bands are also good to try.
I know you want to stop feeling like this and hope we can tell you what to do. Unfortunately we cant do that, but we can support you and hold your hold and be here for you. I know how incredibly hideous it can get when so desperate and not just saying this. Again if you do cut then please be so careful you can get all sorts of very bad infections and then you would have even more problems. Its hard buy try and find one little thing, however small to be kind to yourself with, maybe wrapping yourself in a blanket or listening to a favourite piece of music. It wont take your problems away, but do remember that you need to take of yourself and you do deserve nice things, we all do even if we dont think we do.