Benzos, which xanax is, are very euphoric, they are extremely subtle drugs. Sure they can get you fucked up, drowsy, stumbling, slurring words etc etc, but you cant take them any expect to feel "Great".... unless you are a sufferer of anxiety disorders or panic attacks, in which case they do wonders!
Just make sure you dont take any more, because like I said, they are subtle especially to "normal" people without significant anxiety or panic problems. Let it sink in, and enjoy your night man. Also, try not to drink alcohol, they synergize very well and can lead to blackouts and other problems.