Console app connecting with D365 online

Hi, I am looking to connect with D365 online through .net console app with the below code, and I got the below error, it looks like I have to create application user and get the application id and secret ? can I connect with my logins ? Please advise.

Error message: "An unsecured or incorrectly secured fault was received from the other party. See the inner FaultException for the fault code and detail."

 IOrganizationService organizationService = null;
            try
            {
                ClientCredentials clientCredentials = new ClientCredentials();
                clientCredentials.UserName.UserName = "username";
                clientCredentials.UserName.Password = "password";
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
                organizationService = (IOrganizationService)new OrganizationServiceProxy(new Uri("https://recotest2.api.crm3.dynamics.com/XRMServices/2011/Organization.svc"),
                 null, clientCredentials, null);
                if (organizationService != null)
                {
                    Guid userid = ((WhoAmIResponse)organizationService.Execute(new WhoAmIRequest())).UserId;
                    if (userid != Guid.Empty)
                    {
                        Console.WriteLine("Connection Successful!...");
                    }
                }
                else
                {
                    Console.WriteLine("Failed to Established Connection!!!");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception caught - " + ex.Message);
            }
            Console.ReadKey();