Having a bad game is not a punishable offense, because even the pros have games where they just plan mess up all the time. We are all human, so it's going to happen sometime in our gaming careers. You also mentioned that you are in Bronze 4, and that people "feed"all the time in the games that you lose, and people don't "feed" in the games that you win. I want to explain some of what I believe to be true when playing this game and the criteria for what "feeding" is.
First off, what I believe to be "feeding" is the actual, conscious decision to give the enemy more kills. This can be interpreted in different ways, but the way I see it is if someone is running at the other team, on their own, 1v2-5, and DOESN'T even cast an ability in an attempt to make something constructive happen for the team's success, that person is feeding. This is not feeding: a person dies in lane to their opponent in a 1v1 fight. They go back to lane and attempt the same thing, because the first fight was close or they think that they can beat them now after knowing how they lost in the first place. They die again. They try again after getting a few items, and fail. The person is now 0/3. NOT FEEDING. They are actually trying to see if they can beat their opponent. Feeding is only feeding when it's intentional, never at any other time. At other times, it's just poor decision making, which again, we all do from time to time.
Now, you are in Bronze 4, which means that in terms of skill level and experience, you and all the other players in your division and tier are near the lowest of the player base. That isn't a bad thing, because we were all there at one point. Some of us (including myself) were never in Bronze at all during our ranked careers. That doesn't mean we never played at the Bronze level, it means we didn't play ranked when we were AT that level. So the people you are playing against and with are people who don't play to a very high standard, hence why you guys are in bronze. You CANNOT under ANY circumstances, expect to see Bjergsen level play at your level. You can't, it doesn't exist. If it did, then you wouldn't be in Bronze.
Players are going to mess up, especially at the lower levels. They are ranked at the lower levels because of this, they mess up more often than Silver players, who mess up more than Gold, and upwards through the tiers. Your "bad teams" aren't bad on purpose. They are just not at a very high skill level.
Also, to finish up, the only variable that stays the same in all of your games is YOU. Instead of focusing on "omg my team was so bad, I deserve better teams", focus more on "Hey, we lost that game. What could I have done better to possibly have changed that loss to a win?" You only have control over yourself, so when you lose (and sometimes when you win, because we all win with a bad game) ask yourself what you can do to improve, what you can do to make yourself better so you can climb higher.
Don't blame your teammates. You are the only thing that's the same in all of your games, so improve yourself and criticize yourself instead of complaining. It goes much further if you focus on improving.