!help me i'm angry and confused and I think i'm going to fucking kill somebody!

So Anyway What Happened Was I Was At My bff's House And Her Brother Was Being Dick-Head So We mentioned My Bff's Old Self(Not Old Self Like Anything Demon Related Just She Used To Be Snobby And Bratty) And One Of Her Old "Sadistic" Thing's Were "How About You Trade That Thing On Your Neck For A Face" I Then And There Hit The Brank Of Pure Insanity I Spilled Out With REAL Sadistic Shit Then When I Told Her Brother The Story He Laughed When I Left

He Told My Bff That She Was More Sadistic Just Because She Is Vioelent(NOT SADISTIC) She Even Told Him She Wasent And He Said That She Was Just Because She Drew A Picture Of An Anime Character That Was Holding A Knife (Not That Big A Deal Really!)And She Alway's Hit's Him(Again Normal Brother Sister Relitonship) He Even Said Her Boob's Were About The Same Size(He Didnt Say Bigger)He Said Her Eye's Were Bigger Than Mine And Ive Been Toild My Eyes Are Acually Quite Big And Round Almand Type Her's Are Small And Slanted.And It Is Pissing Me Off Im At The Brink Of Killing Someone....I Said Some REALLY Deserbeing Things As Well..Im Not Quite Sure If My Bff Were Her Old Self.....Im Sorry But I'd Be Pissed At Them Both At The Moment..All Me And Her Got Out Was That She Hit's Him A Bunch Now I Would Understand Her Being A Bitch Sadist If She Threw Him Across The Room And Then Laughed(Not Manicly) And Walked Up To Him And Kicked His Face In Reapetly(Which She Hasent Done) And Yes She Does Talk To Herself But Not Like Insane People..She's Just Like "Hmmm Maybe I Should Draw This..Nah Ill Draw Somthing Else" Other People Are Like"The Voices Are Telling Me To KIll You.." So Yeah Pisses Me Off.... Tell Me What You Think(DONT TELL ME I NEED THERAPY I ALREADY KNOW THAT....I Need A Clear And Sencere Answer

best thing to do is to forget about it relax and thank god for life. don't do nothing stupid that will mess ur life up. (remember sometimes the best thing to do is nothing) and look for Jesus!