jdub delivers a good definition of alcoholic.
if you can be an alcoholic (as defined above) and still lead a productive and otherwise uninterupted life than you are a functional alcoholic.
If being an alcoholic impairs your abilility to perform other activities and responsibilities (such as going to work, or paying bills, having healthy friendships and relationships, getting out of bed, exc.) then you are also a drunk.
Either way, if your an alcoholic, you need to acknowledge that you drink to much. You may want to just try to cut back (only drink socially, stop before you have had too much, attend less alcholic events exc.) if you find this too difficult you should seek professional help and quit drinking alltogether.
Understand that changing your drinking habits may require changes in your lifestyle, social pattens and sometimes even your friends. Just remember your doing what is best for you and your true friends will support you in you effort to better yourself.
Long run your body will thank you and you will feel better, and live longer.