You did the ground work when you were drunk and talked...now I believe it is just to continue what you started. It works for me, as I feel a lot easier to speak when basic ground work is done. If you feel like avoiding conversation with her, may be you can tell her honestly that in certain situations, i feel a little uncomfortable so I feel these blocks in speech, which I am working on. This will help you in 2 ways: First, once told, you will not be embarrassed if speech was not as perfect as you thought it would be. Second, if you really like her and want to go ahead in life with her, then it is very important that she accepts you in your natural form, which I hope she does, but if there is even the slightest of the doubt, then anyways it is not worth going down that lane. In all good spirits buddy, do what you feel is best for you, and whatever happens, trust yourself and embrace your way of speech. You are special.