Float seems to be set to 0 at runtime Oculus Quest

So with having the ability to detect the height of the player in VR, I now am able to use that data in code. This code here grants me a snapshot of the initial player's height at start which will be used in later code.

public Vector3 headPos;

 //Constant
 public float playerHeightAtStart;

 //Variable 
 public float playerHeight;


 public void OnEnable() 
 {
     headPos = head.transform.localPosition;
     playerHeight = headPos.y; 

     playerHeightAtStart = playerHeight; 
 }  

The problem is is that whenever I start the program, playerHeightAtStart is 0 when the playerHeight (continuously being printed) is showing my height. I have tried OnEnable, Awake, and Start and none of them seem to work (I don't know the difference between them so I just tried them for hope), so I think it is my code. I could use a button to set the height or use a timer to grab the height after the runtime has started but I would rather grab the player's height right away.

Thank you for your help!

Edit: Forgive me. For the life of me, I cannot add line spaces to this even if I have done it in a previous post.