Creat a plugin form

Hello
I want to create a plugin that allows me to insert data on a table I create “tablename” and contian the following fields: id, name, email, gender (Mr or Mrs / Miss) Phone

it’s note a wp_table it’s a customized table

Thank you for your help

My code :

<?php
/*
Plugin Name: Formulaire M.ANAYA
Version: 1.0
Author: Mourad Anaya
*/
global $wpdb;

function html_form_code() {
	echo '<form action="' . esc_url( $_SERVER['REQUEST_URI'] ) . '" method="post">';
	echo '<p>';
	echo 'name (*) <br/>';
	echo '<input type="text" name="pf-name" pattern="[a-zA-Z0-9 ]+" value="' . ( isset( $_POST["pf-name"] ) ? esc_attr( $_POST["name"] ) : '' ) . '" size="40" />';
	echo '</p>';
	echo '<p>';
	echo 'gender . (*) <br/>';
	echo '<input type="text" name="pf-gender " pattern="[a-zA-Z0-9 ]+" value="' . ( isset( $_POST["pf-gender "] ) ? esc_attr( $_POST["gender "] ) : '' ) . '" size="40" />';
	echo '</p>';
	echo '<p>';
	echo 'Email (*) <br/>';
	echo '<input type="email" name="pf-email" value="' . ( isset( $_POST["pf-email"] ) ? esc_attr( $_POST["email"] ) : '' ) . '" size="40" />';
	echo '</p>';
	echo '<p>';
	echo 'phone. (*) <br/>';
	echo '<input type="text" name="pf-phone" pattern="[a-zA-Z0-9 ]+" value="' . ( isset( $_POST["pf-phone"] ) ? esc_attr( $_POST["cf-phone"] ) : '' ) . '" size="40" />';
	echo '</p>';
	echo '<p>';
	echo '<p><input type="submit" name="cf-submitted" value="Send"></p>';
	echo '</form>';
}

function deliver_mail() {

	// if the submit button is clicked, send the email
	if ( isset( $_POST['cf-submitted'] ) ) {

		// sanitize form values
		$name    = sanitize_text_field( $_POST["pf-name"] );
		$gender     = sanitize_text_field( $_POST["pf-genre"] );
		$email   = sanitize_email( $_POST["pf-email"] );
		$phone    = sanitize_text_field( $_POST["pf-phone"] );

		// get the blog administrator's email address
		$to = get_option( 'admin_email' );

		$headers = "From: $name <$email>" . "\r\n";

		// If email has been process for sending, display a success message
		if ( wp_mail( $to, $subject, $message, $headers ) ) {
			echo '<div>';
			echo '<p>Merci de me contacter , attendez une réponse bient?t.</p>';
			echo '</div>';
		} else {
			echo 'Une erreur inattendue est apparue';
		}
	}
}

function pf_shortcode() {
	ob_start();
	deliver_mail();
	html_form_code();

	return ob_get_clean();
}

add_shortcode( 'Marrakech_contact_form', 'pf_shortcode' );

?>