I want to run a knife from my neck all the down to my stomach to cut myself out of anger.
That would hurt a lot! Why are you thinking about that?
Because I'm angry.
It would be terrible to harm yourself like that. It sounds like you're having some mental issues, I suggest you visit a psychiatrist.
Why? I'm a tough guy. I don't do things like this.
You are talking about doing it and that is bad enough. You need to get yourself some help!