So, im trying to make a camera collision, like any other game so the camera does not pass through walls, i have the camera attached to the player i tried a lot o different things but nothing, if anyone knows a way it would be very helpfull

Raycast from the player's position to the desired camera position. In the event of a hit, set the camera's position to the hit location.

EDIT: misread, if you're talking about a first person controller you can just use a physics library.

EDIT again: just saw the Unity tag. Check out its Character Controller: https://docs.unity3d.com/Manual/class-CharacterController.html