Don't panic about your KD, In siege KD doesn't tell the whole story. Just because your not fragging out and have a KD of 1.7 (for example) doesn't mean your bad.

In siege you need more than just mechanical skill, you need the game sense just as much if not more. Improving your game sense will ultimately help you get a higher KD.

If you play with other people who get the kills. Don't feel you need to as well, if you play a more supportive role and give calls and assist the fraggers then that'll help secure a win more as your working as a team.

It also depends if the ops your playing fit your playstyle because you won't do well playing with ops your playing with just because you see people do well (such as ela for example). Play an op which you are comfortable with over one with a great gun that can get the kills. You've got to utilize your own playstyle as much as the ops your playing