when I do good, I lose the match, but when I do BAD, then I WIN the match

I mean i see this a lot, but as I support a lot , My doing well doesn't always correlate to being able to carry. even if My adc is doing well, If top is down 8 kills and mid is 1 for 1 or feeding then usually There fed top lane / mid/ jungle can make up for any lead bot has. Though if the ADC and I are doing okay to a little behind, but Top and mid are smashing then the Odds of them being able to snowball to victory just seems higher. Similar affects occur Top as well where if I'm Top and the only one doing okay Then My Top lane is more free to roam and get kills from there winning lanes making My small lead irrelevant.