Tamzin, there is no way I will ever see you as weak, useless or pathetic. What I do see is someone who is hurting badly right now. I can so understand the wanting to do something because it is easier to do it than fight it. I'm not going to tell you not to cut. I'd like to ask you to try to hold on for five minutes more and see then if you still really want to cut.
Don't hate yourself. You have too many positive characteristics to do that to yourself. Read through some of the great threads you have started here and try to see those positive things for yourself.
Whatever you decide, that's OK. I just would like to think you would be able to be kind to yourself and allow yourself to see your good points.
Caroline