Is MMR supposed to be this broken or is it just me?

I'm currently level 48, and approximately bronze 2, yet every game i get put against golds/plats/people that are around 200-300 levels higher than me. This shit is actually making me want to quit this game, i can't try any champion cause i get insta stomped by a one-trick with 200k mastery in blind pick, i can't play anything i know how to play cause i still get stomped due to the enemy having more knowledge and experience about the game, and therefore i'm just stuck playing support 24/7, praying that my adc is somewhat competent. What do?
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