Eh, CS means nothing if you don't make use of it (just like
stacks!).
I rarely lose lane these days when playing my main Nasus, I always go even or win lane, but what screws me most games is when my teammates feed and then the fed enemy camps me and kills me under turret, regardless of me winning my own damn lane. So what I do now, is if I get advantage in lane, I milk it for all it's worth. I make their life hell, zone them from CS, and make them pay for their life every time they even think of grabbing that cannon minion. It's not enough to win your lane, you have to CRUSH your lane, the moment you get advantage, you need to shift focus solely to how you can make your lane opponent as miserable as possible. In low elo, your opponent is liable to ragequit/afk if you shut them down hard enough.
No one promised you that you wouldn't get feeders on your team, there is only one way to fix the problem. You have to get more fed than the fed person on the enemy team. Abuse the advantage when you get it in lane as much as possible. And this is when i'm playing Nasus, who isn't a lane bully at all and doesn't snowball very well, yet I still make my enemy regret the fuck out of giving me first blood, so imagine doing it on any other champ! Especially champs like
who snowball very easily and obliterate the lane if they get the slightest bit fed.