Gone from carrying to not getting a single kill.

I'm around level 22 now, for the last 2 or so levels I have been getting utterly destroyed, not as a team, my team is just as good as the enemies but I only ever get 0 - 5 kills and around 10 deaths a game (Varies). Did something happen to the skill level of the games I'm in or should I just not play (I'm causing my team to lose in most games) ps. The game is becoming unfun since every role I play I just get outplayed. I play, {{champion:67}} {{champion:17}} {{champion:23}} {{champion:43}} {{champion:412}} occasionly others.
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