How does match paring work?

Hello, my name is lennon and 'im 1. I'm quite sort of new to the game, i've been playing since may but i don't play as often so i'm still learning how to play. I would like to learn a bit about match pairings. why am i, an absolute noob, being paired with gold and platinum players? i'm literally really bad and get flamed but i'm still learing so why am i being paired with experienced players? the games are so unfun, like really unfun. if they are in opposite teams they sweep us and it's so frustrating, when they're on my team i keep getting flamed because they expect me to play at their level but I'm still learning. I'm not sure what to do, i'm here to have fun but i just get stressed. here's my op gg thingy for matches thankies
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