Is it bad to cause pain to yourself(to stop anger)?

[DudeRandomGuy]

I know this may sound stupid but every time I swear or I think or do something bad I pinch myself or doing something to hurt me to show my brain any activity like this is bad.
The fact is I am not swearing or doing bad stuff all day to my friends and family and when I am alone browsing the internet or doing other stuff I get all ragious and angry and I start wishing for someone to die inside me :/ For example I walk through the road and I see someone on the road and my brain wishes a car would pass and hit him and I actually imagine the scene of his death.Other times when I am with someone and still want to express anger I swear inside me about him and wish bad things again(this happened even for my older brother that I hate him but he is my brother ) .Other times on the internet I swear on online games or chats and I don't want to :/ I usually do it on the internet.
Anyway everytime I do "bad" things I pinch myself and I don't just pinch me a little I pinch me as hard as I can take without screaming so no one will realise.
Is it good what I am doing?Should I keep doing it?If not do you know any way to "kill" your anger?Oh and I actually like to getting hurt so maybe this isn't a good way to show my brain I want to stop reacting like that.Is it?