3D character catching on edge of objects

i'm quite new to coding and unity but iv'e had great fun following some tutorials, i seem to have run into a problem that is mainly just a nuisance, when i first played around with character movement, i used the rigid body method using AddForce, however this time around i have used a character controller and i am using the Transfrom.Position method now, the issue I'm having is i can jump and land on a cube (for reference) but if i jump and hold the forward key while against the cube, my character then jitters and vibrates, i have gravity and check IsGrounded active. my code is as follows.


>>>
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
public CharacterController controller;

float speed = 7f;

float run = 11f; /// sprint speeed

float sneak = 5f; // crouch speed
public float gravity = -9.81f;

public Object PlayerBody;
public Transform groundCheck;
public float GroundDistance = 0.4f;
public LayerMask groundmask;

Vector3 velocity;
bool isGrounded;

public float JumpHeight = 3f;

public KeyCode sprint;

public KeyCode Jump;



// Update is called once per frame
void Update()
{





//check if the player is grounded
isGrounded = Physics.CheckSphere(groundCheck.position, GroundDistance, groundmask);

if (isGrounded && velocity.y <0)

{
velocity.y = -2f;
}


float x = Input.GetAxis("Horizontal");
float z = Input.GetAxis("Vertical");

Vector3 move = transform.right * x + transform.forward * z;

controller.Move(move * speed * Time.deltaTime);

if (isGrounded && Input.GetKey(Jump)) //<<<< checks what key is being pressed at the current time, in this instance we are looking to see if Jump is being pressed
{

velocity.y = Mathf.Sqrt(JumpHeight * -2f * gravity);
}

if (Input.GetKey(sprint)) // <<<<<<< this is how to get a keybind key input, using "public KeyCode"
{
controller.Move(move * run * Time.deltaTime);
} else {
controller.Move(move * speed * Time.deltaTime);
}



velocity.y += gravity * Time.deltaTime; // remember += means pluss itself, so velocity equals |velocity| pluss gravity times by Time.DeltaTime

controller.Move(velocity * Time.deltaTime);

please help.

 

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