My family life is making me miserable, what do i do?

i have had so much pain caused to my family in the past 2 years.. when i was 14, i did alot of stupid things and began to not like my life so much. I went out and rebelled at a young age and i regret it all. it was that summer of my freshman year, i was getting ready to move from Maryland to California. (my dad is in the military) so we move about every 3, 4 ish years, so i've never really had stability. But in the middle of the move, my baby brother (2 years old at the time) was diagnosed with cancer. This was the worst, most horrific experience i've ever had to deal with. He was so close to death, that it breaks my heart! And on top of that, right when we moved to california, my grandpa (who also had cancer) got very sick and died on his birthday. I was so miserable and depressed. My 15th birthday was a few days later... i attented a funeral on my birthday. :/ We lived with my gramma until we found a house, and i started my sophmore year at a brand new high school, it wasn't easy with all going on. This is when the real problem began. My dad started dissapearing and running off to the casino, blowing ALL of our money. He did some horrible, horrible things. Stealing money from his son, me, my mom, pawning off my mom's jewelry, taking money from my brothers funds, taking all of our tax returns. There is ALOT more he has done.. But he ruined my family, and it was so hard for all of us. My mom wanted to divorce him, but he wouldn't have it. They decided to try to work it out. My dad was sent to rehab, which did nothing, and he maxed out the credit cards there too. The military forced us to move again, about an hour away to the naval base, during the summer of my junior year. I started school at yet another high school, and it was horrible, i absolutely hated it. . my brother's cancer came back, my dad "attempted" to change, but that didn't last very long. I hated school so much, i went on home schooling for half of the semester. All i wanted was to move back to the original school i attended sophmore year, but that couldn't happen. My mom and dad got divorced, my dad got kicked out because he wouldnt stop. And i have so much hate towards him, for what he continually did to my mother, and my family. I went back to school senior year. My dad attempted to kill himself, and my mom drinks all the time and is ALWAYS angry. i've become so miserable i just can't handle being home anymore. I have 5 other siblings, 4 of them younger than me. Oh, i also found out, that my oldest brother, is really my half brother. . the shock from that about killed me. . We finally just moved yet again, in the middle of my senior year, and now everything is a mess, i want to go to my old high school and not another brand new one. i might not even be able to graduate.. i feel depressed. i don't do anything anymore, my mom wants to lock me up in my house just to yell at me for everything. and i mean everything. . i feel like this pain in my heart will never go away. and no one else can see it or understand how i feel. my mom ignores me and makes me feel worthless. i worked full time last year, and have had a job since i was barely 16. . and am currently looking for another job, since i've moved. i have to pay for my car every month 250 dollars, as a 17 year old kid. i pay for everything, my sat's, college applications, gas, you name it. and i have soo much pressures on my shoulders that i cant take it! i am a honor roll student, and i've handled my situations good so far. but i just feel like crying ALL THE TIME now, and i dont want to feel like this anymore. . i've had to grow up way to fast, and no one will cut me a break. i have tried to talk to my mom about this, but all she does is yells and screams at me, she wont hear anything i have to say. I feel like my friends are all distant from me, they are still there, but nothing is the same anymore. The only person i have for me, is my boyfriend. And he lives 3 hours away from me, which is another struggle. im about to break down.. and i just need someone to tell me what to do. i'm so incredibly lost and miserable, and scared. i feel like everything is going wrong. There is always SOMETHING that has to go wrong in my life... i've stayed sooo optimistic for so long, i dont know if i can do it any longer.... someone please HELP. . :(