Getting out when there's no emancipation law

I need advice. Good advice. I need to get away from my house. But there's no emancipation law in kentucky. My mother is very emotionaly and sometimes physically abusive. She has no idea how to be a parent, and even if she did, she's way to selfish to do anything about it anyhow. My biological father could no longer deal with her unstable, obsessive, controling tendencies after being married to her for only a year, and they devorced when I was eight months old. She remarried when I was six because she got herself pregnant by a man who she never loved, and who in no way was fit to be a father. The result was my little brother (Now seven years of age). My step father was hit by a train and killed in 2001. We got some money from it, and it went to my mothers head. She became even more screwed up than she was to begin with, and now it's starting to run out, causing her to feel worthless, because she was using the money to build relationships, due to her insecurities with her own personality. She uses displacement (she takes all her anger out on us and makes us feel worthless) and drinking as coping methods. I feel trapt because I can't get myself emancipated, my biological father (who is my best friend, but lives in California, and I've only met him in person once since the devorce) has no legal rights to me because I (unaware of exactly was going on, seeing as how I was only six at the time) allowed myself to be adopted, and therefore he has no legal rights to me. There's no way that my mother would ever sign anything that in any way would contribute to my living elsewhere until I'm 18 (God forbid she not have someone to babysit her spoiled, undisciplined, ungodly rude son while she goes out and partys, or to clean all her messes and feed and educate her kid). And I can't go to the CPS. They're a joke. Unless there's something as obvious as a missing limb, they won't do a thing. I'd just sound like a stupid stereotypical 15 year old kid, controled by hormones, and getting into normal, expected arguments with my mother. I can see it now, "uh, well, we argue, and she's mean, and she hurts my feelings..." yeah, that'd be very convincing. I have no evidence that she's actually emotionaly crushing to the point of abuse. No visable wounds, no help. I'd like to find a way to get out of here that is almost guaranteed to work, because otherwise, she'll make my life more of a living hell than it already is for trying to leave. My boyfriends family would probably take me in, so I'd have somewhere to go, but it's just a matter of getting to that point. Does anyone have any suggestions?

Would your mother respect your wishes if you suggested that you would like to be adopted by your biological father? That would put him in a position to again intervene on your behalf.

No. I don't think she'd go for that. She's very...how do I put this...stuck up, judgmental, self centered, hateful towards her ex's? She basically thinks that she's better than everyone, and there's no way that she'd ever willingly let me associate with "Scum" like my father. I talk to him on the phone...occasionally, but she even gets annoyed about that. Plus, if he adopted me, she'd fight, which would result in him having only partial custody, in which case visitation rights would apply. Then I'd only be allowed to see him during the court ordered time, correct? And that would only complicate things, seeing as how he lives in California, and I in Kentucky, and transportation is expensive.