Character jumping too fast

Hi, I'm creating a 2.5D Platformer to finish my character controller which uses a rigidbody because most of the obstacles work adding force to the player.

I solved all the movement part in this post (http://forum.unity3d.com/threads/help-with-my-character-controller.429769/#post-2778885) and created a bool to checks if the player is grounded watching some tutorials.

The problem is that now that I tried to make the character jump with this code:

     public float jumpForce;
     
     void Start ()
     {
     myRb = GetComponent <Rigidbody>();
         
     void Fixed Update ()
     {
     if (Input.GetButtonDown ("Jump"))
     {
     Jump ();
     }
     }
         
     void Jump ()
     {
     if (isGrounded)
     {
     myRb.AddForce (Vector3.up * jumpForce);
     }
     }
 

And when I press the button the player moves up extremely fast. Scaling the value just makes the player jump less high (which I don't want, since I need the player to be able to jump 2 units). Is there any way to make the player jump to that height less quick?

PD: There is some drag value to the rigidbody, so that it stops when i stop pressing A or D.