Please make sure of the following things:
1. That you read the post linked in Lex's thread above. In fact, read all of Lex's thread.
2. Do you have a safe place to go if your parents cut you off and put you on the street?
3. Do you have any money? A job?
4. Are there any LGBT groups in Lubbock you can call to get support? If you don't know of any or can't find them, check out
The Trevor Project. They usually keep a list of resources but I assume you already know how to use the internet. Nonetheless, if you need to talk to somebody, they're always available. It's a fantastic resource.
5. Pack a bag with everything you care about in it, clothes, medications, or whatever. Have it ready to go.
Be absolutely positively sure you're in a position you can take care of yourself if you end-up on the street. If you can't, if you're in school, if you need your parents support for 2 more years, then I suggest, don't do it now. Yes it's hard to say that but there's nothing glamorous about living on the street or living in fear of your safety. It's easier to come-out as an adult when you have your own job and your own life to go back to. That way nobody can hold your welfare over your head. If they accept you, great. If they don't then there's nothing to cut-off and you get to go home to your own place, and live your own life. You're in a position not to be blackmailed either. Anti-gay parents can do and say some very ugly things. I worry about your mental and physical health doing it at this point.
If you're in college, I suggest living as you want there and, perhaps, look to transfer to school in a city with a larger gay population and then try and find ways to stay away from home during the summer.
I hate to say it, but if you can hold out another 2 years, coming out will be a lot safer for you.