How long until my MMR drops

I keep getting matched in really unfair games. I only hit lvl 30 about 2 days ago and currently doing my placements but every game i keep getting placed with high silvers and low golds and i just do terrible, even when i try to play super defensive i somehow manage to finish the game like 2:9 and get flamed by my team and reported. Should I go back to normals or should I grind out the placement matches and i'll get players of my skill level soon?
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