the biggest thing i can tell you, is that you cannot win every game. no matter how well you play you can still lose the game.
People in higher elo still make the same mistake that you're suggesting but they are more aware of it and alot more apologetic when they do.
If you want to carry the game alone, I suggest you pick a carry role, like mid or top or adc. Jungle can work also tho but it depends on the type of jungler you're playing, don't main support in low elo cause no matter how many assist you have your team mates will always have more deaths, but do learn how to play support so you don't feed bot lane.
and last thing is that you need to learn the game in terms of strategy wise. Its hard for me to list all of them cause it very situational and there's alot of them.
The best thing to learn strategy is to watch higher elo players that know the game and know how to teach it and learn from them. (i recommend trick2g)
The 2nd best is just experience.
Learning the game will go really far for you because it can help you reduce the amount of loss on your team if you know when to split push, how to control objectives. how to position and how to focus, how to group, team comps, how to initiate/dis engage and a whole bunch more.
good luck man and again remember you can't win every game