Just do your best and try to focus on your own play instead.
Everyone has bad games, and there is usually a lot more to them doing poorly than just being awful players. The people you play with are at the same normal or ranked ELO at you which means you are roughly of equal skill. Difference is that when people feed and do poorly they shrug it off and move on to the next game, while it´s still really infuriating when others in your team are doing poorly and you tend to remember that more.