They are driving me up the wall....

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Basically, my family drive me up the wall. I don't get on with my older sister and don't know why, ever since we were children we never had. It was argument after argument after argument... Today was a nightmare but instead I was awake. Came home with my boyfriend, we were having an argument and then she decided to butt in and tell me to 'shut it'. First thing I said 'what has it got to do with you?' and then there we go, we worst argument we have ever had. There was punching and kicking. My boyfriend and my mum's fiancee finally stopped us and the I decided to go for a walk with boyfriend following behind. He told me that what he could see is that I was over reacting, yes she was rude and horrible but there was no need to scream, punch, shout etc. After a long thing he was right :\ I have come to an conclusion I have anger issues. :( He gave me some tips on controlling my rage rather than lashing it out at everyone around me. He told me to go to an empty field where no-one can hear you and scream!!! What do you do?