I can't imagine any scenario where actual friends would feel betrayed by you not drinking.
I have friends that I drank/camped with for over a decade. They still drink, and they are nothing but supportive.
It sounds like your outright saying alcohol is a pre requisite for your friendships, so your flirting with pretending to be what they want, or expect. If you can't be who you want to be, and you feel like you have to be who they want you to be, your wasting precious energy that you will need for your sobriety on nonsense.
I agree that you should go to the wedding. Not the reception, and that you seek more honest meaningful people to spend time with.