Not entering a regatta because you're afraid you'll do damage to other boats is like saying that you wont drive on highways because you're afraid you'll damage other cars.

In other words, get out there man, the other sailors around you will recognize right away that you might be having some difficulty handling the boat and will take care of themselves around you. Then when you get back to the beach they'll be more than happy to share nuggets of information with you that will make you more comfortable out there.