Tilt

So I just lost a really close game that was in my team's favor for most of the game. I find it very difficult for my team to follow what I'm saying cause they either get really greedy for kills (Katarina) or decide to go after champions to catch them out, only to overchase and get killed themselves.... How do I stop these kinds of games? I had a similar game as Caitlyn two games before that game as well. I generally try my best to do well but sometimes it just doesn't go in favor of the whole team since you can't just control the other four people. I try to also encourage them to pick champs that fit our team comp but that also does not always work...