why is CSGO so hard?

Counter-Strike always has, and always will remain.. "hard" to those who don't play it.

It's a competitive shooter that is NOT centered around casual players, mainly due to the many difference aspects to it;

- Spray Patterns.
- Communications/Call Outs/Coordination.
- Learning Smokes/Flashes/Grenades.
- Money Management.
- Gamesense.
- High levels of Mechanical Skill.
- Awareness/Positioning.

Personally, I've hit DMG and that's about where I sit. Not the best rank, but I'll take it.
If you want to get into CS:GO, you truly need to be committed to improving.