mmr system broken?

Exc promatix - Summoner Stats - League of Legends
Exc promatix / Diamond 1 50LP / 69W 35L Win Ratio 66% / Gangplank - 34W 12L Win Ratio 74%, Volibear - 10W 6L Win Ratio 63%, Brand - 5W 5L Win Ratio 50%, Urgot - 8W 1L Win Ratio 89%, Jax - 7W 1L Win Ratio 88%
Hello Everybody, I am currently diamond 1 and am having problems with my mmr. With a winrate of 66% I currently get +12 and -18 lp. I know that I am getting matched with a lot of diamond 2 players but I cannot believe that this is intended behaviour and should be looked into. Climbing just feels super disheartning and frustrating right now. Anyone got any tips on how to Improve mmr or should I just create a fresh account because this is unfixable? kindest regards
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