Tell your girlfriend. If she accepts you, you get married and live a happy life. If she doesn’t accept you, you can find someone else who will accept you. Being transgender is a) much much easier with support and b) something that you can’t waste time with bc hormones are more effective the younger that you are
Using a tunnel is definitely the way to go and very easy to set up. Please don’t share over https if you don’t know what you are doing