I used to think the same way as you.
On my old account I was always stuck between Bronze 1 and Silver 5. I always blamed my team because theyd feed over and over, or would afk.
I went to my second account, which went back to unranked because i didnt play it for months. 1 month later I made it to gold 4. I then went back to my main account that was Bronze V 0 LP, and now, after only 1 month I made it to gold V on that account as well.
Its not about your team, its about how you play (in low elo). Once you get higher and higher in elo, thats when feeders/afkers are a problem. Because now they have players just like you, who know how to carry with their lead/advantage. Bronze players and Silver players both do a lot of wrong things. They dont farm good, they dont know how to trade correctly, they dont main 1 champion but instead switch between different champions every game not knowing its limits, and they dont group. Learning how to play correctly in low elo means you can win easily with just 3 people. Heck I usually made them surrender on my own by just pushing my lane to their inhib (top lane). Easy stuff low elo.