I was in the cockpit asking the CA for a ride while the agent was running my ID, it was taking awhile so I went up to check. He was trying his hardest but couldn't get me listed. My CASS check was fine but he couldn't get me on the paperwork. The flight was already delayed so I got left behind. I also had to go down and have the rampies open up the bag door to get my bag. I was ****ED.