So how does MMR Work, cause I keep getting matched with low elo's.

Hey there, just how does mmr work? I'm Gold 2 and my mmr is 1.537. Apparently this is low, but why is it? I'm Gold 2 and I get matched with Silver players, it drastic affects my performance in ranked because when I play I'm not playing at my own skill level. Riot pls, I'm sick of getting shouted at because my 0/5 team mate thinks he's better than me and I'm bad :( I though I left Silver behind months ago....#ELOHellNeverEnds.