WordPress wp_create_user problem

Hello . In my wordpress site I am trying to dinamically create users . I knew that wp_create_user is the way to go . But using that function with the following arguments wp_create_user( $username, $password, $email ); seems not to be taking care of all database table records we really need to have a completely new user . Why I came to that conclusion is that when a user is created through admin the wp_usermeta table is also changed but when I do that with this function only wp_users table gets changed . Is there any better way of doing or am I doing something wrong ? Thanks .