Pick up object

hey guys i have this script for picking up an object with rigidbody attatched to it .sing

 System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class grab : MonoBehaviour
 {
     public GameObject item;
     public GameObject tempParent;
     private bool cangrab;
     public Transform guide;
     // Start is called before the first frame update
     void Start()
     {
     }
     // Update is called once per frame
 
     void Update()
     {
         GroundCheck();
         if (Input.GetButtonDown("grab"))
         {
             GetComponent<ConstantForce>().force = new Vector3(20, 50, 0);
             if (cangrab == true)
                 pickup();
         }
         else
             GetComponent<ConstantForce>().force = new Vector3(0, 0, 0);
             drop();
         }
         void GroundCheck()
         {
             RaycastHit hit;
             float distance = 3f;
             Vector3 dir = new Vector3(0,0,1);
             if (Physics.Raycast(transform.position, dir, out hit, distance) && hit.transform.tag == "interactable")
             {
                 cangrab = true;
             }
             else
             {
                 cangrab = false;
             }
         }
         void pickup()
         {
             item.GetComponent<Rigidbody>().useGravity = false;
             item.GetComponent<Rigidbody>().isKinematic = true;
             item.transform.position = guide.transform.position;
             item.transform.rotation = guide.transform.rotation;
             item.transform.parent = tempParent.transform;
         }
         void drop()
         {
             item.GetComponent<Rigidbody>().useGravity = true;
             item.GetComponent<Rigidbody>().isKinematic = false;
             item.transform.parent = null;
             item.transform.position = guide.transform.position;
         }
     }

i dont know what am i doing wrong but the moment i press play the object directly transfer in the player hands..plz help me