I think my input in this topic will have to be that in low elos, too many people focus solely on their KDA, and want all the kills to make themselves feel good. You will have jungles that come in to gank your lane when you're down 2 kills, and kill both of your low health lane opponents after you've harassed them down to that point. You need to feed the carries, but people don't understand this, they just want to get fed, be pro, and hoist all you guys on their backs while they carry you as a tank and 1v5 the enemy team, causing you to lose the match. Its always best to spread out the kills, however. Dont expect to have all/most of the kills. A good team will have a nice spread of gold, not just one person fed
Edit: I also looked at your match history. Youre dying WAY too much, so maybe you can get those kills because youre not there to actually do your roll, because you get picked off and get tossed out of the fight too soon. Stay in the back, only go in when your other team mates initiate, and only attack the safest person you can. It is not your job to go in and assassinate their squishies, youre there to only do damage. Never travel into unwarded areas alone, in case your deaths are caused by getting ambushed and caught out