Matchmaking

Okay, here it is: What if my team really keeps me in low ELO? Before you quit, this isn't about Ranked so actually not real ELO climbing, but people say I'm bad while they are actually feeding. An example: Last Game, my toplaner got executed twice, so did my jungler, (Lissandra and Rek'Sai), and my support Leona was 2/0/0 while Varus was 0/6/2. I myself was Talon mid, one of my first times, and got camped by their Jax jungle and their Nidalee mid. Then my sister started gaming, and since we just switched Internet Providers, my internet is a bit weird sometimes, so i started lagging at 300 ping. When i say what they could do like: Rek, you might not want to ult into 5 people while only Lissandra is there and no one to back you up cause Lissandra is running from their team, they rage me and say i am the worst player of the game, while I, with the lagg even, had the most kills, and usually i get high scores (some games ago 25/9 with a Veigar vs Zed mid) but this is just too much. What could i do to make this better? just Mute everyone?