how many times must i get to my series to just get demolished?

I have made it to my promotion series going on six times now! At first i thought that it was just bad luck and next time will go differently (i mean i get a free win after all right?) However each and every single time it goes exactly like it did before, up until i hit my series i am doing fantastic and am playing with people who are just as good as me or even better and then bam its series time i go into with a positive attitude but it always seems we go through champ select nothing out of the ordinary the game starts everyone is there people walk to their lanes and the enemy team gets first blood (this is when shit hits the fan) "wtf were you doing" or "well gg its all over now" and before i know it my whole team is at each others throats and can not stop criticizing each other for any simplistic mistake made even when it made no difference in the outcome of the situation they will relentlessly thrash each other for little more than nothing at all. And we of course lose the game because we are just frantically typing at each other. is there some sort of reason that this happens it seems every single time? if it happened like once or twice even 3 times i would be like OK this is just coincidental and i need to change up my strategy and try a different approach. but this has happened to me five times now i just want to know why i can breeze my way through 2 sometimes even 3 games to get into my promos and then just get completely outclassed skill and mindset wise to the point that it was apparently decided within the first 30 seconds of play time. It could be just me maybe i take the other games less seriously and am more relaxed about the outcome and just find it easier to play at peak performance under those circumstances. Either that or there is something built into the ranked match making that would add that extra layer of difficulty of having to deal with players that are more prone to express their anger with what is happening in game through chat, or players who don't seem to understand the game as much as you do (I know that im just bronze tier at the moment and my understanding of most of this games mechanics isn't the greatest however i have been playing the game for now at least 3 years and do know certain things about this game) what i want to know is how do i go forward when it seems nigh impossible to get through my series successfully given the fact i have been there 5 fucking times and of those five four times i was given a head start of a free win but still manage to lose the following 2 games when just hours before i was playing fucking great and playing with people who also played well didn't flame in chat when something didn't go as planned and generally were in an upbeat. Does riot just dislike me and not want me to move out of this (if so that's fine im sure there are plenty of other games where the creators actually like to see their players enjoying themselves) or am i just unlucky?