Is there a website that I can go to to find out what medals/ribbons I have earned while in service? Currently in the military and need to find out if I'm missing any that I am not aware of.

Your unit's adjutant's or 'XO' office should be able to help you out in a much better way.
But if it helps see the site below, it has got updated info on service medals.
http://www2.powercom.net/~rokats/medals.html

You may also be able to find some info in here:
http://www.military-quotes.com/military-medals.htm