2 Player movement problem

So, when i jump, my character's air horizontal mobility becomes really high so he goes super fast.
And also when i start the game my character is stuck in crouch...

Code (CSharp):

1.  public float runSpeed = 22f;
2.  
3.     float horizontalMove = 0f;
4.  
5.     bool jump = false;
6.  
7.     bool crouch = false;
8.  
9.     // Update is called once per frame
10.     void Update()
11.     {
12.         horizontalMove = Input.GetAxisRaw("Horizontal") * runSpeed;
13.  
14.         if (Input.GetButtonDown("Jump"))
15.         {
16.             jump = true;
17.         }
18.  
19.         if (Input.GetButtonDown("Crouch"))
20.         {
21.             crouch = true;
22.         } else if (Input.GetButtonUp("Crouch"))
23.         {
24.             crouch = false;
25.         }
26.  
27.  
28.     }
29.  
30.     private void FixedUpdate()
31.     {
32.         //Move
33.         controller.Move(horizontalMove * Time.fixedDeltaTime, crouch, jump);
34.         jump = false;
35.     }
36. }
37.  

Thanks in advance