Rant/Advice on a friend?

It Is my bestie, I don't know If It Is just me that see's It but It Is seriously freaking stressing & confusing me out. I don't understand why she has to act this way. We have been friends for around 7-8 years..since high school so It Is hard for me to not say anything to her that would come across as mean because I don't want to fight. She tends to snap at you If you try to talk to her about herself as If It Is an insult, she takes offence all the time and tries to turn It around om you even though It was nothing mean to start off with. She Is sort of two faced, she talks to people all nice then says all the names under the sun about them to me. I would also say she pretty much contradicts herself sometimes when she makes such a big deal about others doing It however when she does It It is alright and It Is not a big deal. I feel bad for saying this on here but I really need to let out some steam because I know for a fact I will end up saying something to her ever though It is not intentional she will still take it as an attack. When I was growing up I will admit I was really rude, mean to parents, teachers ETC.. I also knew she was the double of me although since the years have gone by I have realised she has gotten worse.. way worse than I ever was and because she knows I use to misbehave all the time she will say It was "me" that made her this way.. even her mum said It.... But that Is just Bull sh*t.. People may rub off on others however YOU are the one who chooses to act like that no one makes you do anything. Take this for instance My birthday was a few weeks ago and we were busy so the weekend after that we went out, we had a plan on what to do (she always talks about the fact the other girl we know always wants everything her way.. here comes the contradicting), we were going to a pub then club. A few friends were running late so we sat in a pub and waited on them knowing we will go to the proper destination once they appear hmm well... It got to a point were it was getting close to the club opening and I said I think we should go and she said I quote " there is no point, the club is opening soon" after it was her idea in the first place ... I invited a few people out and obviously It was my night so I had to mingle with everyone.. she had the rudeness to turn around and say blah blah why are you not speaking to such and such.. you invited them out.. I damn bloody well was speaking to everyone maybe not as much as I could but she could have spoken to her while I was chatting to someone else.. like seriously?.. And she sat with another mate trying to take the piss out of me.. He is this big fat guy and thinks it is funny to rip the piss out of me because I use to be fatter than what I am at the moment... Well anyway Once we got in the club one hour In she said she had a migrain so she left with her boyfriend and the fat guy left too not even giving a **** he is my mate too.. Some best friend huh.. I had another child hood friend with me and she was uncomfortable because we were in a rock club which she didn't enjoy because she is not into that although she stayed for me... We got drunk, bumped into a few other people and had a blast... I wouldn't say I am scared of my "besto" it is just her reactions which I can't stand they are so negative and hostile that stops me from actually getting close with her, don't get me wrong she is an awesome friend when she wants to be and we have a lot in common.. I question myself sometimes saying "Is this really what a friendship is".. I don't want to throw it all away but It is a ******* challenge sometimes... Rant over lool ^_^