Why are all the games I've been playing so one-sided against my team?

I went into the new season today pumped, thinking I would do well, and then lost all 6 games I played over the course of the day. I took breaks to make sure I didn't tilt, and all that jazz, but if it isn't me getting 3 man top at 8 mins, then its me playing with a brain dead support while I'm trying to survive as an adc. It's come to the point where no matter what I do I can't make a difference against a team that has even the smallest lead. So why is this? I have no clue why im on a 6 lose streak and not being placed with either better teammates or worse opponents, because obviously I'm trash , so why can't my opponents be trash for once? I love playing this game but when I go from winning 6 in a row in preseason to losing 6 in a row in normal season, there might be a problem with riots stuff.