Some games are unwinnable (Some). But a Vast majority of the games you lose there is always something you can do. As you get more time and experience you can learn from your mistakes. You are the only constant in all your games. You are the only thing you can change. Everyone gets "those kinds of teamates" on there team a majority of their games. Solo isn't Luck. Sure theres a tiny % chance a noob player can have a lucky streak and climb but its rare.
There is a reason people consistently climb each season with ease to the rating they max out at. You will never win or climb more when you try to find blame on anyone in your team but you. There is always something you could do better this includes for pro players. If you are someone who is constantly blameing your team you won't climb. The only thing you can do is admit there is so much more you can do to vastly improve your chances of winning.
If you continuously focus on yourself rather then blameing other players who are playing poorly on your team your winrate will increase. Record your games rewatch them. You might not even see your mistakes until you understand the game better. Find a higher level player ask him to spectate you and point out things you could do to improve. Not every game is winnable but you can win a lot more games if you learn to stop blaming your teamates and focus on yourself.
I was stuck in silver 5 for the longest time, I convinced myself it was trolls on my team who feed repeatedly. After months of raging a friend of mine said let me spectate your games. AS I told him I am so much better then everyone in this elo (Turned out I was ass). And he pointed out multiple things I was doing terribly. After talking with him I decided to give it a shot his way. And then for the first time in months I started to climb slowly at first but more climbing then I had done in months. And I would continue to pick apart my games asses to the best of my knowledge what more could I do.
Some examples, I bought more wards and I warded my teammates lanes who where over extending with no vision. I would ward enemys jungle to track enemy jungler. I would make sure I was watching map more to warn my team when people were coming. I wouldn't try to 1v1 someons lane when they aren't there when I don't understand the matchup and different power levels. I still have a lot to learn and I still need to figure out ways to improve its a never ending cycle unless your faker.
Every Division has "Those kinds of team members ". Look It's a giant wall of text with massive grammar mistakes so let me TLDR THIS BISH. You are the only constant in every single one of your games. Some games you can't win. You belong in the division you are in. If you think you should be higher Look at your own gameplay and improve. Good luck on the rift summoners.
LAST MINUTE ADDTION: This video sums up "ELO HELL" extremely well. Jokeing aside this video is pure genious. https://www.youtube.com/watch?v=AJ4vPCY11eM