Also you may like the smaller maps. Before the conquest server gets packed (mornings and early afternoon) we run Domination maps, which are similar to conquest, but the maps are much tighter quarters, and all infantry.
that way you don't have to run for 10 minutes. And you should come and try again with us. get in a squad, make sure someone is running medic to revive.
Also the last patch has changed how the guns work, and made a lot of improvements to the game overall.
I am a run and gunner also, and i'm not the best but i usually come out with a 1 k/d or so...
Remember it is a completely different beast than CoD. to be successful in it much more teamwork is required.