No collision on trigger and character controller

I'm trying to make a bullet object that travels across the level and destroys what it hits. When I use an OnTriggerEnter or OnCollisionEnter, it doesn't detect any collision whatsoever. Here is my code:

bulletScript.js

 #pragma strict
 
 var playerObject : GameObject;
 
 var bulletMove : Vector3;
 var bulletLife : int = 2;
 
 function Start () {
     while(true){
         yield WaitForSeconds(bulletLife);
         Destroy(gameObject);
     }
 }
 
 function getBulletSpeed(bulletSpeed : Vector3){
     bulletMove = bulletSpeed;
 }
 
 function Update () {
     
     transform.Translate(bulletMove,Space.Self);
 
 }
 
 function OnCollisionEnter(collision : Collider) {
     Destroy(gameObject);
 }

And here are some screenshots of my setup