Why do you always have to lose after couple wins in ranked ?

I know matchmaking is trying to force a 50% win ratio. But all that does is make me feel like I'm not doing anything, that only matchmaking decides whether I lose or win. I say this because EVERY time you win 2-3 games you get a 0/10 whoever. I know you can't have a 100% ratio because I don't play good every time either but god damn, in my 3 years of playing this game I can honestly say I was literally never 0/10 in ranked. Yesterday I also had a 2/18 adc after I won 2 games. If those were normal games that you just got outplayed or whatever but fucking 0/15 people losing you the game seems to me that matchmaking is forcing you to lose or you have to be some fucking challenger player that has an account with 90% win rate. I didn't play ranked for 6 months because of dynamic q and I see now how I was a lot less tilted when I didn't play ranked.