Rotation Issue for Player to mouse cursor

I have never posted on here before, I try to make sure if this is the right place. If it is not I apologize ahead of time.
In regards to my issue: I have mad a PlayerController script and in that script is a LookAtMouse Method. The problem is I can get the player to rotate to the mouse but it only works if i do 2 or 3 rounds around the character for the character to move its rotation. I have been working on this for a while and I am about to quit. I am a little better than a beginner.
Also I do not want to use Rigidbody for any form of movement or controls, and any tutorial I have read says this is fine, except the late update. that was me trying to do something different.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlayerController : MonoBehaviour
6. {
7.  
8.     public float speed = 3.0f;
9.  
10.     public Camera cam;
11.  
12.     void Start()
13.     {
14.        
15.     }
16.  
17.     // Update is called once per frame
18.     void Update()
19.     {
20.         Movement();
21.      
22.     }
23.     private void FixedUpdate()
24.     {
25.         RotateToMouse();
26.     }
27.     private void Movement()
28.     {
29.  
30.         float moveX = Input.GetAxisRaw("Horizontal");
31.  
32.         float moveY = Input.GetAxis("Vertical");
33.  
34.         Vector2 movementXY = new Vector2(moveX, moveY).normalized;
35.  
36.         transform.Translate(movementXY * speed * Time.deltaTime);
37.  
38.     }
39.  
40.     private void RotateToMouse()
41.     {
42.  
43.         Vector2 mousePos = Input.mousePosition;
44.         Vector2 mousePosition = cam.WorldToScreenPoint(new Vector2(mousePos.x, mousePos.y));
45.  
46.         // Debug.Log(mousePosition);
47.  
48.         Vector2 playerPosition = new Vector2(transform.position.x, transform.position.y);
49.  
50.         Vector2 directionVector = new Vector2(mousePosition.x - playerPosition.x, mousePosition.y - playerPosition.y) * Mathf.Rad2Deg;
51.  
52.         float aimAngle = Mathf.Atan2(directionVector.y, directionVector.x) * Mathf.Rad2Deg -90;
53.         Quaternion aimRotation = Quaternion.Euler(new Vector3(0, 0, aimAngle));
54.  
55.         transform.rotation = aimRotation;
56.  
57.     }
58. }
59.  

but I am not a coder in the slightest thought. Help Please and Thank you

 

Seems your problem is you're mixing up your screen point and world point. Input.mouseposition is already a screen point, and transform.position is a world point. However, your code treats them exactly opposite to this. Try changing cam.WorldToScreenPoint to cam.ScreenToWorldPoint.

 

Thank you!

such a "simple" thing and i been wrapping my head around what I did wrong!

That fixed it! TY!