Look, I get the frustration. Sometimes a game is out of your control.
However, you need to remember. If you deserve to be a higher division, you have a lower chance of your team losing. Statistically speaking, you have the advantage. Let's say that there is one player that is just an insta-loss. Your team has only 4 opportunities to get this player, because you know for a fact that you are not this player, where the other team has 5 chances. This is the main thing that ensures that good players ascend (even if it is a little bit slowly sometimes) while bad players will either remain stable at some division, or fall a division.
Also, think of it this way: if you are good, but everyone else in bronze is trash, you have 4 trash players, and they have 5. I'm sure you have a lot to learn about the game. I know that I personally have a lot to learn, and so many others in bronze, silver, or even some people in gold probably have something in this game that they could learn to improve.