Collision not working

Ok, so i got the code right here :

 using UnityEngine;
 using System.Collections;
 
 public class RogueSheet : MonoBehaviour {
 
     public int Level = 1;
     public int Exp = 0;
     public int ReqExp;
     public float MaxHealth = 100;
     public float Health = 100;
     public float Mana;
     public float Str = 10;
     public float Stam = 8;
     public float Int = 5 ;
     public float Luck = 12;
     public double DamageRed;
     public double CritRate;
     public int CritDmg = 200;
     public double Damage;
 
 
     // Use this for initialization
     void Start () {
         print(Health);
     }
     
     // Update is called once per frame
     void Update () {
 
         ReqExp = Level * 100;
         MaxHealth = 92 + Stam;
         DamageRed = Stam * 0.3;
         CritRate = Luck * 0.3;
         Damage = 10 + (Str / 2);
         Mana = 20 + Int;
         if (Stam > 8)
             Health = MaxHealth;
     }
     void OnCollisionEnter(Collision _collision)
     {
         if (_collision.collider.gameObject.tag == "Enemy")
         {
             print("HIT!!!!!!!!!");
         }
     }
 }

The problem is it wont check for colision, i tryied removing the stats and let just the collision script and still nothing. I can confirm that the enemy its on "Enemy" tag and that it isnt kinematic. Also both bodies have rigidbody attached to them. Any help ?

Also, i tryied both

   if (_collision.collider.gameObject.tag == "Enemy")

and

 if (_collision.gameObject.tag == "Enemy")