Не переключается True False. Что делать?

using System.Collections; 
using System.Collections.Generic; 
using UnityEngine; 
 
public class RotateTank2 : MonoBehaviour 
{ 
 
 
 public Transform Selftransform;  
 
 public int speed = 6; 
 
 public bool rotate = true;
 
 
 
 
 // Use this for initialization 
 void Start() 
 { 

 
 } 
 void RightRotate() 
 { 
 transform.Rotate(0, 0, -3); 
 } 
 void LeftRotate() 
 { 
 transform.Rotate(0, 0, 3); 
 } 
 // Update is called once per frame 
 void FixedUpdate() 
 { 
 
 
 if (rotate == true && !Input.GetKey(KeyCode.D)) 
 { 
 RightRotate(); 
 
 } 
 
 if (rotate == false && !Input.GetKey(KeyCode.D)) 
 { 
 LeftRotate(); 
 
 } 
 
 if (Input.GetKey(KeyCode.D))
 
 
 rotate = !rotate; 
 
 Selftransform.position += Selftransform.up * speed * Time.deltaTime; 
 
 } 
 else 
 { 
 
 } 
 
 } 
}