Why is there always gold/plats in my normal game?

I am not even a premade queue. I only duo with one of my friends and the enemy team seams to get really high elo players which just dumpster our bot lane/jungle and theres nothing you can do about it because they are horrendously fed. Its not fair for bronze/golds to go against plat/golds. Why is match making so shit? Even ranked flex has the same freaking problem.

Can we propose a fix? This is honestly not a fun environment. My friend who duo's with me is trying to learn and improve the game and its not fun to get shat on by a high elo player...