Also, does anyone else have the same problem?
Most Helpful Guy
I'm a hardcore FPS player dude, one shall help a brother out.
Some tips: of your game has slight of hand, use it. It allows you to reload and aim down sights faster.
Always pick guns which are balanced. (Damage usually conpensates for accuracy or vice versa)
Keep playing, practise really does make perfect.
Throw your flash/stun grenades into rooms or tight areas before you make your move, if they're dazed; you're more likely to kill them.
Don't play too aggressive, or you'll be picked off easier.
UAV is your best friend.
Before you go through doors watch out for claymores and trip mines.
Finally, don't give up. Everyone sucks when they first start, only time will give you experience and make you better. Good luck!