Hi and Welcome,
I'm glad you are seeking support.
What I can tell you is that recovery involves making a LOT of changes in your life. For me, that included people and places where drinking was involved. Yes, it's a hard choice to make, but I am grateful and thankful every single day, that I made that choice.
You said your girlfriend told you she would not go out with you if you didn't drink. That statement shocked me. I wouldn't go out with anyone who told me what I could or could not drink/eat/wear. But, that's just me.
I hope you take a look around here and you will see lots of support and know that you can live a sober life.