PSA: If you are truly hard carrying while your teamates feed, and you die and lose the game...
It's still your fault that you lost the game. You had it in your hands the power to greatly influence the outcome of the game, and thus it was your responsibility to carry that game. You had it in your hands, but you dropped it.
Don't say that 'my team deserved to lose' or 'I shouldn't have to 1v9 to win' or 'how is that fair?'.
At the end of the day, if you are the one who is performing well that game then it is your responsibility to take on that burden of pulling your team through their rough early game and holding the line until they can recover and you get a chance to turn the tides.
If you are the 10-0 full build adc or mid or whatever who is the single factor that keeps your team in the game, you simply cannot afford to just do whatever you want and chase for kills or get caught out or anything like that.
If you, as the best player on your team, make a mistake and die and your team loses because of that then you threw the game for your team.
Yes it feels unfair, yes it's a lot of pressure, yes it feels like a lot of responsibility that you shouldn't have to shoulder alone, yes that's a burden to carry... but thats just it, thats what it MEANS to carry. if the time comes when you are in this position where you are your teams only hope and you throw it away, you have noone to blame but yourself no matter how poorly your team performed - because you were the one with the power in your hands to make a difference.
TLDR: If you are truly hard carrying your team, be very careful with your decisions and plays because if you yolo and throw the game then it's your own fault - regardless of how everyone else on your team may not have 'deserved to win'.