Can Someone Give Me Advice on CS:GO

OK, you now know I'm a 60-year old female playing these games, but can someone give me some tips on how to handle those darn sniper rifles in CS:GO. I die so quickly and wonder how the other team can snipe so easily. I hear there is a program that makes you aim quicker, but that's cheating and I would really like to get better in the game myself. Any suggestions on how to improve my skills?