why is CSGO so hard?

CS is not hard your oponents are really that good. You have to constantly keep improving in the game. If you are just beginning try taking to some good players and get a feel for how they think I the game.

You should also know your weapons.

Try sticking to just one weapon and practice on e you get better try the next one.

Also, it's a team sport so you must learn to coordinate and listen.