Coming Out Support Group
This community is dedicated to the challenges that gay men and lesbian women face, both between the partners in a relationship and from other influences (family, society, etc.). Find support and talk to others who may be facing the same challenges, and share your experience.
(I'm facepalming rn cause I sound like my mom lol)
Also, I've been there, done that, so if you need advice, or someone to vent to or whatever, I'm here :)
What are they supposed to do to support it?
You are what you are. You fancy what you fancy. It is what it is.
Nothing anyone can do, but I don't think anyone has to support you in it. Any more than you would support them in their sexuality. Everyone's sexuality is their own bag. Nobody else's business, and nobody else's problem.
Your parents love you, and need to know you and know who and what you are so that they can love you better. So you just go ahead and do your thing. But carry your own sexuality, because that's your job as an adult.
As to the GF, what is she, twelve? Send her home and date an adult.