I got mine up through helicopters. Granted, I know the pilot very well (we were in a clan together as helo pilot/gunner), so gunning for him was awesome, that and the fact I am a very good gunner (not giving myself a big head, just a little plug lol). It also helped that we were on our clan ranked server most of the time and could have easier access to the helos.
My advice is simple: Forget it. If players are judging you based on K/D ratio, screw them. Pick something you are good at and enjoy, and play it. I did very well my first few months of playing as a medic - I had countless people tell me that I was good and played my "position" as a medic well, and I would go through many rounds dying 10-15 times and getting maybe 5 kills, but healing/reviving many, many teammates, and end up second or third with alot of points from these. Trust me - play with smart people, and screw the rest, and you will be appreciated. Recently, I have begun to take on sniping as a new hobby (having pretty much gotten my fill of medic and Anti-tank lately), and I have been doing very well with that, too.
Not to sound cliche, but I have been doing what I enjoy doing and I have been playing well with it. Don't stress - just enjoy the game.
For all the good that the stat tracking is doing and however cool it is, once in a while I miss the good ol' BF1942 days where each round was anew and players played to play, not to bring up their stats.