swing - JPanel won't show up in JFrame(main class) - Beginner Java

I'm just starting out swing in Java... I have this problem
about creating a separate JPanel class to be put in the main class (the one with
JFrame), that the JPanel won't show up in the main class. The program can run but only
the frame would show up. I was hoping that I would see the panel with the 'hallo' label
but no.

I know I've been looking for the other
solutions in this site, but I didn't really get some of it.

This is my JPanel
class:

import
            javax.swing.*;

public class CreatePanel extends
            JPanel

{
 private JPanel panel = new JPanel();

            private JLabel narrate;

 public void setNarrate(String
            label)
 {
 narrate = new JLabel(label);

            panel.add(narrate);
 panel.setVisible(true);

            }


 public JPanel getPanel()
 {

            return panel;

            }
}

This is
the main class with the
JFrame:

import
            javax.swing.*;

public class Maine extends
            JFrame
{
 private static JFrame frame = new
            JFrame();

 public static void main(String[] args)

            {
 new Maine();


 CreatePanel panel1 = new
            CreatePanel();

 panel1.setNarrate("Hallo");

            panel1.getPanel();
 frame.add(panel1);
 }


            public Maine()
 {
 frame.setTitle("Detective
            Game");

 frame.setSize(500,500);

            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            frame.setVisible(true);
 frame.setLocationRelativeTo(null);

            frame.setIconImage(new ImageIcon("agent.png").getImage());

            }
}