How do I stop being rude to people?

Anonymous
I am a honest person, I tell the truth. Or well at least to the people that I a close with. (Like my siblings for example)
I get mad very easily. If someone is rude to me, I am rude back.
For example, the other day me and My little sister were playing a building game online with a bunch of strangers. It was a "build to survive" type of game. I built a big house, then a bunch of boys came and destroyed it by putting their random blocks on my house. They also built stairs so that the enemy could come and kill me.
I told them to stop, they didn't listen and laughed at me (we have voice chat) so I moved and built a new house. They followed me and destroyed it to, laughing. I got so mad that I yelled at them to kill themselves, that no one loves them, and so on.
I regret doing that so much because they actually seemed hurt by it. And what do I know, maybe they were suicidal? Maybe something was going on in their life? After all it was just a game, I shouldn't have said that.
I keep on doing this mistake over and over again whenever someone makes me mad, wether it's in real life or online.
I don't tell my siblings to kill themselves, but I call them stupid, whores and so on when they piss me off. They get hurt by it a lot and start crying.
Today I called my 11 year old sister a bunch of names because she had an attitude to me. She said that I am always so rude.
I am aware of that, and I want to stop. I don't want to be a rude person but I can't control it.
And if you're wondering my age, I am 14 (born in 2007) so I turn 15 this year.
Any advice are highly appreciated!
How do I stop being rude to people?
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