rigidbody's & camera rotation

Unity Engine
1

Hello people, I got two question’s

  1. Why when when I’m walking with my character against objects with rigidbody, they start moving. Also my character starts flying around and sh*t.

  2. I followed a tutorial on internet about third person camera, but I need to help.
    How can I only let it rotate when I click with the right mouse button, because now directly rotates when I’m moving my mouse.

private const float Y_ANGLE_MIN = 0.0f;
    private const float Y_ANGLE_MAX = 50.0f;


    public Transform lookAt;
    public Transform CamTransform;

    private Camera Cam;

    private float distance = 10.0f;
    private float currentX = 0.0f;
    private float currentY = 0.0f;
    private float sensivityX = 4.0f;
    private float sensivityY = 1.0f;

    private void Start()
    {

        CamTransform = transform;
        Cam = Camera.main;
    }

    private void Update()
    {
        currentX += Input.GetAxis ("Mouse X");
        currentY += Input.GetAxis ("Mouse Y");

        currentY = Mathf.Clamp (currentY,Y_ANGLE_MIN, Y_ANGLE_MAX);
    }
       
    private void LateUpdate()
    {
        Vector3 dir = new Vector3 (0, 0, -distance);
        Quaternion rotation = Quaternion.Euler (currentY, currentX, 0);
        CamTransform.position = lookAt.position + rotation * dir;
        CamTransform.LookAt(lookAt.position);
    }
}
2
  1. Your character has probably too small mass.
private void LateUpdate()
    {
        Vector3 dir = new Vector3 (0, 0, -distance);
        Quaternion rotation = Quaternion.Euler (currentY, currentX, 0);
       if (Input.GetMouseButton(1)) {
           CamTransform.position = lookAt.position + rotation * dir;
          CamTransform.LookAt(lookAt.position);
       }
    }