How to lower my MMR?

Im a new player and have been doing fairly well in normal games, however I started playing with my bf who is lvl 30 diamond MMR. We won a few games and this has boosted me waaaay above my skill level. I am feeding in most normal games now.

I understand its good to play against people more skilled than you to learn quickly but Its getting tiring being outplayed at every move. I really want to be matched with people my own skill level again. Is there any way to lower my MMR quickly? Even on the games I feed my teammates often carry the game and we end up winning so its not being adjusted appropriately.

Example: Maybe I just need to vent but just recently I played a game on leblanc vs another lvl 30 leblanc. She obv had the advantage from the start will full runes and masteries with over 1k wins where mine is around 30. I really struggled but did my best to learn, but i just couldnt trade with her and died 4 times to her 1 in laning phase (and many more after). It was only made worse by the jungler raging at me and verbally abusing me after that the entire game, calling me mentally disabled. I have been reported now for feeding and its ruining my fun and motivation to play. :|

Thanks