OK, I don't like the answer I'm about to give you, and I'm sure others won't like it either...
In a perfect situation, I'd tell you to wear your pink triangle proudly and wave your rainbow flag high and all day long, and tell him about PFLAG.
But you're not in a perfect situation. You're far from it. It sounds like you're in a very dangerous situation. So I'm going to tell you to be concerned with your safety first. Presumably, your family has a restraining order against your dad because you're afraid of his violent behaviour. Also, you said he went psycho when he saw your facebook group. It doesn't sound like it's physically safe for you to be out at this point in your life. So go back in, at least in your physical world. That sucks! It's not fair! It's not right! But again, your basic safety is what's most important. It doesn't sound wise to add more fuel to this fire.
For Facebook, unlike all the lgbt groups. Set up a second fb account, perhaps in a different name. Block your dad and all your relatives who are on fb. Use that account to like lgbt groups and interact with other lgbt youth. Run your browser in private mode when you access that account. Clear your cookies when you log out. Don't let your computer/phone store the password. Being out virtually sounds much safer than being out actually.
Despite the enormous pressure of your family difficulties, try your very best to stay out of trouble and get good marks in school. Get into a good college that has lgbt clubs. Wait to be out in college where/when it's safe.
In the meantime, talk to a supportive guidance counselor if you have one. It would be helpful to have that as a support option because it will most likely be difficult for you to hide that part of who you are for now.
I'm sorry. I HATE this answer. But again, your physical safety is what's most important right now.
Answered Nov 17, 2011
Edited Nov 17, 2011