MATCH MAKING IS SO ABSURD!

so yeah i reached diamond with 57% win rate then all of a sudden i get these garbage team mates in my games with win rates that are either 43%-50%??? And the sad part here is the enemy are mostly 53-56% winrate and im playing as a support i mean WTF are these match making? And to worsen it, i mostly get 3 adc main or 3 support main in my team???!!!! So from my 57% win rate im now down to 52%, this is actually tilting, tried to be patient and all, but WTF is happening with my games. Cant i just have a decent team who doesnt feed their lane then complain later on when they are the reason why the games are getting hard. AHHHHHHHH RIOT GAMES FIX THE GAME!!!