Mouse extrem fast

You can change your mouse sensitivity by going to Options -> Controls -> Mouse Settings and changing the Sensitivity slider.

@Egietje i tried but even at the lowest it doesnt work

Is your mouse sensitivity high outside of minecraft as well?

not really… when i go to Options or inventory its normal again but when i go outside its bad again

Can you attach a video of the bug?

can i do one with the smartphone? that would work

What mouse do you use? Also have you tried toggling "Raw Input"?

I use the Razer Abyssus v2 wehere do i find  Raw Input?

so i have the same Problem with steam games and other mouses too i dont know if that helps

In this case, you need to adjust the speed of the cursor either within Razer's software or using a physical button on the mouse. Please refer to their help pages if you need support doing so.