Should I talk to my gay girlfriend about her lack of PDA?

I can relate with her it would make me uncomfortable too. Get over it. It a personal preference of hers that you will learn to have to deal with. Maby she is not comfortable with her uality yet. I can see your frustration because you want to show her off and let everyone know she is yours, but the fact that she shows no PDA does not mean shes not your girl.