So I finally beat the storyline in new vegas and sided with the NCR. After I kill the final boss, forgot his name, I walk down and then there is a cut scene followed by credits. Now after I went to the main menu, I hit continue hoping to go play more of new vegas and finish some unfinished quests, but when I hit continue all it does is bring me back to my last save, which is right in front of the guy for the final cut scene. Is there a way to get around this? Can you play after you beat the storyline?

No. It has been said countless times that there is NO POST-GAME PLAY.

this was available to be known for months before release.

I think we already have a thread for this in DLC Discussion: http://www.gamesas.com/index.php?/topic/1164277-fallout-continuation/