imagine being fucked while you have 144hz
You're probably trying the wrong plays.
Try to play more uncommon angles (Off angles) so as to not get pre aimed and fucking rekt by aimers.
Try to start with: nofap, healthy diet, enough sleep.
dont stand still on angle where enemy expects you to be, predict their peeks and prefire, if you dont know when they will peek adad, or stand in cover and swing out when they are moving out of cover. be careful not to bait your teammates doing the last option, you do have to jiggle peek to get the info.
when you know where enemies are, use flashes and peek them while they are blind, instead of waiting for them to peek into you. take the fight to the enemy.
dont look at pro games and try to put your crosshair on the edge of a corner like them. in pro games people have good movement and usually dont wide peek angles. in your online games people will run out wide and hope you start spraying like a bot and miss 5 bullets and they can kill you while you are inaccurate.
put your crosshair far enough away from the wall, that when an enemy runs out at full speed, you can click mouse button and hit them without moving the mouse.
play off angles 1-2 meters further in from where you usually stand, so that you can hit enemies in shoulders when they try to prefire your position.
also, what is your ping usually?
i had the same problem, my brother did something on my pc and now i have a much better reaction time, not quite sure what he did but i always run this program before i open cs, and my windows thinks its a virus :/ but it works!
Imagine needing a boring skill that you can't even IMPROVE in order to play an FPS game hahahahaha. Just quit CS, cancer boring game, not even a real FPS. Go play Quake, a real FPS title.