unfair teams much ?

lost 6 games in a row, 4 of them with positive kdas and 2 with bad kda, but both were because mid laner wouldnt help me in our own side jg in silver bronze elo, so why am I losing these many games in a row, there should be a prevention from being paired with bad teams 6 times in a row i think the limit is four if the computer sees 4 losses it should put u on a more stacked team, but that is not the case the more i lose the worse the enemies get i cannot cs when i am getting ganked 7 times by there jg and my yi hasnt ganked a single lane, in gold + this doesnt happen, everyyone in gold + can understand the basic info of the game, so again can you explain to me, how teams are matched cuz im just confused? How is this possible that not one of my teammates could carry any of those games, not 1! so am i suppose to carry every game i win, cuz there are 5 people on a team, and even if I do good I cant handle 4v5 im a silver player so with lower elo brackets there needs to be a prevention list, losing 90 lp in one day and getting demoted cause your teammates arent providing the ganks or the assualts that the enemy counterparts are providing at low elos. IM JUST A SCRUB SILVER BRONZIE PLAYER I CANT HANDLE 2v1's AND IF THE MIDLANER DOESNT WANT TO FOLLOW ENEMY YASUO INTO MY JG 6 TIMES IN 8 mins THEN I SHOULD BE DEMOTED RIGHT? 2v1 @RIOT