Not fair pairings

Hi, it has not happened that there are times you start badly, you stay behind, and when you finally get a couple of good items and decent champions and you think you can come back, the machine pairs you with the player who goes first, super op, and erases you without giving you the chances to still in fight. I think Riot should change the pairing system, and that the duels be with the one right below or above you , that will give more chances to continue in the game and it will be fairer.