[2D SHOOTER] My Bullets are not working as i expected

Hi everyone. I'm trying to make a Twin Stick Shooter game, based on games like Nuclear Throne and Enter the Gungeon, but i have a big problem. In my game, for shooting, instead of using the mouse cursor, i use the arrow keys, the problem is: the bullets are working as a group, which means that when i shoot a bullet for the left direction, and then i shoot a new bullet for another direction, all the previous shooted bullets will change their direction based on the direction of the last bullet fired.

And i want to know how can i fix that. Sorry if my explanation wasn't good enough, english is not my mother language. Thanks in advance.

My Code:

BulletScene

extends Area2D

var spd = 10

onready var caminho = get_node("/root/Mundo/Player")
onready var caminho2 = get_node("/root/Mundo/Player/Position2D")

func _ready():
	#Setando a rotação correta da Bala | OBS: Setei no ready por conta dele rodar as coisas bem antes
	if (caminho2.position.x == 25 and caminho2.position.y == 0) || (caminho2.position.x == -25 and caminho2.position.y == 0):
		$AnimatedSprite.rotation_degrees = 0
		
	if (caminho2.position.x == 0 and caminho2.position.y == -30) || (caminho2.position.x == 0 and caminho2.position.y == 35):
		$AnimatedSprite.rotation_degrees = 90

func _physics_process(delta):
#Funções para direcionar a basa [DIREÇÕES COMUNS]
	if caminho.detectDirection == 1:
		shootRight()
	if caminho.detectDirection == 2:
		shootLeft()
	if caminho.detectDirection == 3:
		shootUp()
	if caminho.detectDirection == 4:
		shootDown()
	
func shootRight():
	position.x += spd
func shootLeft():
	position.x -= spd	
func shootUp():
	position.y -= spd
func shootDown():
	position.y += spd

Player Scene

var bullet = bulletPath.instance()
	if Input.is_action_just_pressed("ui_right"):
		detectDirection = 1
		$Position2D.global_position.x = global_position.x + 25
		$Position2D.global_position.y = global_position.y
		bullet.position = $Position2D.global_position
		get_tree().current_scene.add_child(bullet)
		
		print($Position2D.position)
	
	if Input.is_action_just_pressed("ui_left"):
		detectDirection = 2
		$Position2D.global_position.x = global_position.x + -25
		$Position2D.global_position.y = global_position.y
		bullet.position = $Position2D.global_position
		get_tree().current_scene.add_child(bullet)
		
		print($Position2D.position)
		
	if Input.is_action_just_pressed("ui_up"):
		detectDirection = 3
		$Position2D.global_position.y = global_position.y - 30
		$Position2D.global_position.x = global_position.x
		bullet.position = $Position2D.global_position
		get_tree().current_scene.add_child(bullet)
		
		print($Position2D.position)
		
	if Input.is_action_just_pressed("ui_down"):
		detectDirection = 4
		$Position2D.global_position.y = global_position.y + 35
		$Position2D.global_position.x = global_position.x
		bullet.position = $Position2D.global_position
		get_tree().current_scene.add_child(bullet)
		
		print($Position2D.position)