People say losers/winners queue doesn't exist, but tbh i find it kinda hard to believe?

I'm all for blaming myself when it's my fault, but why am i going on a 8 game loss streak and the next day i'm going on a 8 game win streak? My mental hasn't really changed either, i'm pretty chill when playing games.

The real difference between the two sessions was that in my winning streaks i was actually getting people who would fill the necessary role and not go SG 4-9 in every match, and if they were going DPS they would still play decently. I'm not saying losers queue is definitely a thing, but i don't know why else this would happen so often.