There is a mod (idk the name of it) that shoots a bullet when I hold down the left mouse button.

[devout hamlet]

you've described almost every projectile weapon on the workshop

can you be a tiny bit more specific?

[quick prawn]

when i equip anything and hold down the left mouse button its shoots a bullet

[frigid moth]

i think you are referring to a 'gun'

[devout hamlet]

1. Disable half your mods
2. If that fixes it, enable the mods again and repeat step 1 with only that half
3. If that doesn't fix it, enable the mods and repeat step 1 with the other half

eventually you'll find the mod responsible

[frigid moth]

this is the most efficient way

binary search

[quick prawn]

anything i equip even a bat for example

[devout hamlet]

do those steps

[quick prawn]

not even a gun

[devout hamlet]

if your next message is anything other then "yes I will do that" or "I found the culpable mod" we'll know you don't actually want to fix the problem

[quick prawn]

I will try

i deleted a mod and it stopped

[devout hamlet]

nice, now you know the mod