Ah I see. Do the 'Best Friend Forever' assignment. You can check the details and your progress in the My Soldier menu. All you have to do is accumulate 10 revives and 10 heals (so needs to be done playing as assault class) and you unlock the FAMAS assault rifle which should help you rack up some kills. It is about the only gun you can unlock nice and quickly without having to get kills.
Otherwise make sure you get the objective, so arm/defuse if you play Rush or capture flags in conquest. You will earn XP and unlock weapons by doing that regardless of how many times you kill/get killed.
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