Abusive parents. options?

my mother is abusive, when she was growing up her dad was on meth, but he died shortly after so she has unresolved family problems. she also had ADD and bipolar disorder, so not only does she go from acting rationally to being a violent uncontrolled mess, she does it at random times when she gets distracted and it brings back harsh memories. my father is useless. he doesnt know what to do about her, and has been trying to "fix" her his entire life. i think he holds on to some shred of memory of her from before she went insane. but yeah, i have a crazy, abusive mother and a pive father who wont admit it. i've tried to talk to him about divorce, but he is a devout christian and doesnt believe in that, and he denies that there is any abuse to begin with. there is no physical abuse, but i work out. my parents know they couldnt take me in a fight. i have decent friends, which is a fairly good support system, but i have severe depression (suicidal behaviors) and i dont know what to do. child services wont help, i mean the foster care system is just terrible, and my extended family grew up under the same cirstances as my mother, so my aunts and uncles are just as crazy. i can't drive yet, and i have braces so i cant be ped as an adult which would stop me from living on my own or bouncing between friends houses every night. i keep a go-pack with $1,000 cash, 2 days of clothes, all my toiletries, and a copy of my birth certificate, which thank god i have only had to use twice. i suppose i could wait half a decade to get out on my own, but i dont know how ill pay for college, or getting married, or if i can't find a job in this bad economy if i leave my parents behind completely, which is ideally what i'd like to do. what options do i have?