ItemMeta item help

So I am making a plugin but I can't seem to see if a players inventory contains an itemstack. Here is the code

Code:java

if(p.getInventory().contains(Main.im)) {
p.getInventory().removeItem(Main.im);
p.launchProjectile(Egg.class);
p.updateInventory();
}

and the main

Code:

public class Main extends JavaPlugin {
 
    public static ItemStack im = new ItemStack(Material.FLINT, 1);
 
    public List<String> SkillList = Arrays.asList(new String[] { "EXP", "Master", "Barter", "BigGuns", "EnergyWeapons", "Explosives", "LockPick", "Medicine", "MeleeWeapons", "Repair", "Science", "SmallGuns", "Sneak", "Speech", "Unarmed" });
 
    public void onEnable() {
        setupPistolAmmo();
     
     
        ShapedRecipe PistalAmmo = new ShapedRecipe(im);
        PistalAmmo.shape(new String[] {
                "FFF",
                "FBF",
                "GGG"
        });
        PistalAmmo.setIngredient('F', Material.FLINT);
        PistalAmmo.setIngredient('G', Material.SULPHUR);
        PistalAmmo.setIngredient('B', Material.STONE_BUTTON);
        Bukkit.addRecipe(PistalAmmo);
     
        PluginManager pm = Bukkit.getServer().getPluginManager();
     
        pm.registerEvents(new Util(), this);
        pm.registerEvents(new GunHandler(), this);
    }
 
    public boolean onCommand(CommandSender cs, Command cmd, String label, String[] args) {
     
        Player p = (Player)cs;
     
        if(label.equalsIgnoreCase("test")) {
            p.openInventory(ItemIcon.openInv(p));
        }
     
        return false;
     
    }
 
    public void setupPistolAmmo() {
        ItemMeta im = Main.im.getItemMeta();
        im.setDisplayName(ChatColor.AQUA + "Pistol Ammo");
        Main.im.setItemMeta(im);
    }
 
}

I want it to basically see if it contains the PistolAmmo and remove 1 from their inventory. Can anyone help?