You've played little bits of each gametype and pubstomped to boost your k/d significantly but your stats are pretty low. People used to do it on cod all the time so this is nothing new. You may be good, but you don't have enough stats for your k/d to be accurate. Pubstomping doesn't mean you're good. Try playing 5k+ of each game mode and then come back haha, or play against a full fireteam of skilled players with your own team.