I need help I suck!

If you "suck" at games like Call of Duty 4 then all you have to do is keep playing and you will eventualy improve, and some people are naturally good or bad at games like this as well. Anyways, to kill people in seconds in Call of Duty 4, technically, is for basically every bullet you shot off to hit your target or for one or a few bullets to strike the target in his head. If you want to kill enemies fast then you should either resort to sniping(i would go with m40 with claymores, stopping power, and steady aim/iron lungs with normal scope, pretty much a solid 90% for a 1-hit kill)if you have the patience or use a good assault rifle( preferably a m4-carbine, m16, or g36c), smg (mp5 and p90 are great choices), or my favorite, a lmg ( the rpd is one of my favorite guns and my overall favorite lmg). Just keep practicing and experimenting with new guns/attatchments/perks and you will improve.

get a sniper rifle and stay far distance and use your scope and be steady and carefully snipe their heads off. trust me it will work.

if ur on ps3 i could help u

youtube.com/user/hyeflyer23

just keep playing, i use mp5 with stopping power 3 frags and dead silence. But dot let it take over your life like it did me about 3 yewars ago when i played halo 2 alot just play for fun hope i helped.