Losing Ranked

I know what everyone is going to say, I am blaming my team and I need to focus on my mistakes and be positive and I will win. That is just not the case. I constantly lose ranked games. I have won one game in the past seven or so. A good amount of those had someone go AFK, every one of the losses there is a lane that feeds an insane amount of kills and it gets to the point where the fed enemy can literally one hit any one of us. I win my lane, or at least I don't feed, in over 90% of my games. I understand that kills and winning lane is not everything but it is a start. I can't get back to Silver because of games like this. Another thing I looked up, my last game the people I played with were all bronze, on losing streaks, and had very few games where they were positive and I went against almost all silvers, on win streaks, and who crush in their games. I have had about three or four games where I get someone who says, "I don't care about this game", "I don't care if we lose", "This is my smurf so I don't really care if we win". I can't be expected to carry 1 v 5 because that just simply can't happen when 4 of them are outrageously fed and can one hit me. I roam, I play every position in the game, I switch with people when they want the role I have because they are more comfortable with it, and I always start out the game with positive thoughts and I don't tilt or get upset when people make mistakes or give early kills. I get upset when people keep making the same mistakes, play for themselves, or just simply don't understand what they are doing or who they are playing. I also get no win streaks like a lot of people seem to get. I will win one game very rarely and then go right back to losing. I was in Bronze 1 for months going up and down and finally I got demoted and kept the losing streak and now I am sitting at 25 lp in Bronze 2. I was put into Silver 5 last season right from my provisionals and I was put into Bronze 3 this year and I can't get back to Silver. I take breaks after a few losses so I don't tilt and I always start new games with hopes of winning. I don't care what anyone says, having a positive attitude will not win games.