my bullet doesn't work properly

I'm trying to fire a bullet toward the mouse but if I fire then it goes to the wrong direction what should I do?
and the offset I set is 90

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class weapon : MonoBehaviour
6. {
7.     public GameObject projectile;
8.     public Transform shotposition;
9.     private float Timebtwshots;
10.     public float starttime;
11.     public float offset;
12.     void Start()
13.     {
14.        
15.     }
16.  
17.     // Update is called once per frame
18.     void Update()
19.     {
20.  
21.         Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
22.         float rotz = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;
23.         transform.rotation = Quaternion.Euler(0f, 0f, rotz + offset);
24.         if (Timebtwshots <= 0)
25.         {
26.             if (Input.GetMouseButtonDown(0))
27.             {
28.                 Instantiate(projectile, shotposition.position, transform.rotation);
29.                 Timebtwshots = starttime;
30.             }
31.         }else
32.         {
33.             Timebtwshots -= Time.deltaTime;
34.         }
35.     }
36. }
37.  

this is the code for my weapon

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class projectile : MonoBehaviour
6. {
7.     public float speed;
8.     public float lifetime;
9.    
10.     void Start()
11.     {
12.         Invoke("DestroyProjectile",lifetime);
13.     }
14.  
15.     // Update is called once per frame
16.     void Update()
17.     {
18.         transform.Translate(transform.up* speed *Time.deltaTime);
19.     }
20.     void DestroyProjectile()
21.     {
22.         Destroy(gameObject);
23.     }
24. }
25.  

and this is the code for my bullet

 

sorry I forgot to change transform.Translate(transform.up* speed *Time.deltaTime);
in to transform.Translate(Vertor2.up* speed *Time.deltaTime);