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How do I use my ghillie suit in COD MW2

I keep getting killed in my ghillie suit when I play call of duty modern warefare on my ps3.  How do other people keep seeing me?  I hide in the tall bush and people still kill me all the time.  Any tips on how to get better?  My score always sucks.  It’s like 2 and 10 all the time.  Also, how do I get a sniper rifle in the game.  I keep getting the M4 with the red dot sight?  Please help me get better, this game rocks if only I could kill more people.  Thanks alot for your help.