Look at my sig.
And chuccck, that's how everyone feels when they start this game. On average, it will take a whole clip, even for good players, to kill someone. Everyone is really good now, I suggest starting out in unranked games. I also suggest using the BAR or StG44 to start, then, once you start getting your aim down, to move on to the other guns if you wish. Find the gun that works best for you.