same, had to lower my sens to oblivion and i still cant aim properly (used to be on a pretty high sens). even tried changing res if that would make any difference but still inconsistent that i miss on literal nothing.
sometimes i just think my osu client is bugged or something but yeah it is realllyyy demotivating.
on the other hand (tho this is not working for me), id suggest maybe going down to playing low stars, changing skins, lowering sens (depends), and experimenting with grip styles / sitting positions.
edit: yes changing skins does have an effect on gameplay (atleast for me, especially hitsounds and circle itself)