How to get away from my suicidal thoughts?

I am sick of being used, I know people are coming to kill me, nobody takes me seriously and says I am being stupid... my heart is heavy and my soul is dead. Everyday I have more suicidal thoughts than before, I am really considering slitting all my arteries now as I am sick of it. Getting help is out of question as they think I am being stupid. I wish I was taken seriously but I am not. If I don't kill myself, someone is going to kill me anyway. What do I do? I am really thinking about getting it over with tonight.