Charachter goes trough everything even the terrain :(

sup guys i was wondering if anyone could help a newbie , i'v just finished building a large map for my survival game and just finished with some animations on AI / Player model. only the player model have that problem it goes trough everything , i'v did a little bit of testing and changed to a mouse rotation , and stil i rotate it down in ground charachter (player model) keeps going down . it walks like there is no psyhics :(

Here is the controller code wish someone could help me out to fix it :( using System.Collections; using UnityEngine;

 public class Zombiecontroll : MonoBehaviour {
 
 
 
     static Animator anim;
     public float speed = 10.0F;
     public float rotationSpeed = 100.0F;
 
     //Mouse Look
     public float horizontalSpeed = 2.0F;
     public float verticalSpeed = 2.0F;
     //End of moouse look
 
     
     // Use this for initialization
     void Start ()
     {
         anim = GetComponent<Animator>();
         
     }
 
     // Update is called once per frame
     void Update()
     {
 
         float translation = Input.GetAxis("Vertical") * speed;
         float rotation = Input.GetAxis("Horizontal") * rotationSpeed;
         translation *= Time.deltaTime;
         rotation *= Time.deltaTime;
         transform.Translate(0, 0, translation);
         transform.Rotate(0, rotation, 0);
         
 
         if (Input.GetButtonDown("Jump"))
         {
             anim.SetTrigger("anim_Jump");
         }
 
         if (translation != 0)
         {
             anim.SetBool("anim_Running", true);
             anim.SetBool("anim_idlee", false);
         }
         else
         {
             anim.SetBool("anim_Running", false);
             anim.SetBool("anim_idlee", true);
           /*  {
            /* }
                 //mouse look start codes
                 float h = horizontalSpeed * Input.GetAxis("Mouse X");
                 float v = verticalSpeed * Input.GetAxis("Mouse Y");
                 transform.Rotate(v, h, 0);
                 //mouse look end coding 
                 */
 
             }
         }
     }
 

Sorry for my bad english, i just started like 4 months ago with unity and had a nice idea to create a survial game :( i'm lost of hope already, been 24h awake to try sovle , not even google helped me