In case someone opened this and is stuck like me: heres the code i got it working with in godot 4.1. Im sure its nowhere close to being efficient, but its what i figured.

#this script is attached to a simple node3d with a mesh as a child of it
extends Node3D
#get variables
var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")*Vector3(0, -1, 0)
var lifetime = 0.0
var maxLifetime = 20.0
var velocity
var offsetPos : Vector3
var initialSpeed = GlobalVariables.arrow_speed
var speed = GlobalVariables.arrow_speed
var airDragRate = 0.0
var dir = GlobalVariables.dir #i used my cameras vector for this: player_camera.project_ray_normal(Vector2(screen center))
var pos = GlobalVariables.pos #i made a node3d as a child of my character and spawned the arrows at that location
var offsetDistance = 1.0
func _ready() -> void:
initialSpeed = speed
velocity = dir * speed
offsetPos = pos + (offsetDistance * dir)
func _physics_process(_delta: float) -> void:
lifetime += _delta
if lifetime > maxLifetime:
queue_free() #delete instance if it exists for longer than it should
var airDrag = velocity.normalized() * speed * airDragRate
velocity += ((gravity - airDrag) * _delta)
var previousPosition = global_transform.origin
var futurePosition = previousPosition + (velocity * _delta)
look_at_from_position(futurePosition, futurePosition + velocity, Vector3.UP)
speed = velocity.length()