Enemys dont collide in follow script

As i said above, my enemy's are programmed to only follow the player, but if more than one is following me, they go inside each other. I want them to stay apart and follow me separate, can anyone tell me what I am doing wrong?

He has colliders on every body part. he is also designed to slow down if close to you so that he can attack, but the attacking has not been implemented yet.

 var target : Transform;
 var speed = .5;
 var rotationSpeed = .2;
 var actualSpeed;
 function Start()
 {
     actualSpeed = .5;
 }
 
 function Update()
 {
     transform.rotation = Quaternion.Slerp(transform.rotation,Quaternion.LookRotation(target.position - transform.position), rotationSpeed * Time.deltaTime);
     transform.localEulerAngles = Vector3(0, transform.localEulerAngles.y, 0);
     transform.position = Vector3.MoveTowards(transform.position, target.position, actualSpeed*Time.deltaTime);
     transform.position.y = .1;
     
     var distance = Vector3.Distance(target.transform.position, transform.position); 
     if (distance <=  3)
     { 
         actualSpeed = speed / 2;
     }
     if (distance >  3)
     { 
         actualSpeed = speed * 2;
     }
     
     if (Input.GetKeyDown ("space"))
     {
         //GetComponent("enemySlow").enabled = false;
     }
 }