i hit like nothing, like i m playing first time

hi,

i used to hit. but the last days somehow i hit nothing, or if i do. I d call it rather a lucky shot, (if its a headshot). I ve recently changed my mouse but changed it back now.

its like regardless what gun i use, ak47 can forget, unless its in egypt. and with m4a1 1on1 i still get pwned.
maybe its my mousesettings? maybe i use wrong crosshair? ( i m using the 3rd)
i really dunno what i m doing wrong can anybody help?

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