I think most everyone here is absolutely right. We were all beginning divers at one point. I remember having exactly the same feelings you did, especially becuase I was diving with considerably more advanced divers. The upside of diving with more advanced divers is that once you get past feeling akward and worried that you'll slow them down, you learn a lot from them. Just be honest about your being a beginner. It's amazing how much good advice and help you will get!
Where in FL are you? It might help to dive with the dive operators who are more geared toward newer divers. That will probably help your comfort level (dive guide in the water with your group, for example) a little bit, too. Most of the dive charters in south Florida that I have been with run at least one boat a day during the week, so just becuase you aren't off on the weekends you don't have to give up diving. And mid-week diving is usually nice becuase the boat isn't as crowded!
You haven't wasted your time ad money certifying.... you're just getting started on your adventures!