2D character gets stuck when falling

Hello.

I ran into a problem i have no clue how to fix. Whenever my 2D character is falling and i get in touch with a wall, the character tends to get stuck mid-air when pressing in the same direction as the wall. What i want, is to fall down to the ground, whether i'm touching my keyboard or not. How does one fix this problem? I'm still pretty new to coding so please explain to me like i'm 5.

Thank you for helping.

The code (C#):

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Character : MonoBehaviour
 {
 
     Rigidbody2D rb;
     private Animator anim;
     public float speed;
     private float moveInput;
     private bool isGrounded;
     public Transform feetpos;
     public float checkradius;
     public LayerMask WhatisGround;
     public float Jumpforce;
 
     AudioSource audio;
     public AudioClip ActualJump2D;
 
     // Use this for initialization
     void Start()
     {
         anim = GetComponent<Animator>();
         rb = GetComponent<Rigidbody2D>();
         audio = GetComponent<AudioSource>();
 
     }
 
     // Update is called once per frame
     void Update()
     {
 
         if (moveInput > 0)
         {
             transform.eulerAngles = new Vector3(0, 0, 0);
         }
         else if (moveInput < 0)
         {
             transform.eulerAngles = new Vector3(0, -180, 0);
         }
 
         if (moveInput == 0)
         {
             anim.SetBool("isRunning", false);
             anim.SetBool("isIdle", true);
         }
 
         else
         {
             anim.SetBool("isRunning", true);
             anim.SetBool("isIdle", false);
         }
 
         isGrounded = Physics2D.OverlapCircle(feetpos.position, checkradius, WhatisGround);
 
         if (isGrounded == true && Input.GetKeyDown(KeyCode.Space))
         {
             anim.SetBool("isJumping", true);
             rb.velocity = Vector2.up * Jumpforce;
 
             audio.PlayOneShot(ActualJump2D, 0.3F);
         }
 
         if (rb.velocity.y == 0)
         {
             anim.SetBool("isJumping", false);
         }
 
     }
 
     void FixedUpdate()
 
     {
         moveInput = Input.GetAxisRaw("Horizontal");
         rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
     }
 
     void OnCollisionEnter2D(Collision2D col)
     {
         if (col.gameObject.name.Equals("Grass Tile [moving]"))
             this.transform.parent = col.transform;
 
         else if (col.gameObject.name.Equals("Grass Tile20 [moving]"))
             this.transform.parent = col.transform;
     }
 
     void OnCollisionExit2D(Collision2D col)
     {
         if (col.gameObject.name.Equals("Grass Tile [moving]"))
             this.transform.parent = null;
 
         else if (col.gameObject.name.Equals("Grass Tile20 [moving]"))
             this.transform.parent = null;
     }
 
 }