Super unlucky ranked

My ranked games yesterday on my main acc consisted of a booster on the enemy team who won the game, an autofill into my worst role, a team that relentlessly fed talon and bot lane, and 1 victory. I tried to play one more game but I checked op.gg in que and I got 3 ADC AUTOFILLED on my team and at that point I quit for the day. My LP went from 37 to 6 in about 7 games total I think; a whole day devoted to ranked and I have gained nothing. And for some otherworldly reason whatever champ I am maining at the time that I play ranked is either banned or picked before I can pick them 70% of the time. Why am I so unlucky?