My own home's the reason I have issues?

I have abuse, DSS, affair, violent, scary issues in my home, have two legit AD HD & ADD siblings who always treat me like crap, verbally and physically. My parents, especially my dad, verbally abuse me. Fat, stupid, lazy brat, sh*t, idiot, moron, spoiled, moose, as*, fag got, you name it. When I was 6-7 my dad would threaten to break my jaw or would show me a wall and say he'd put me through it. They always depend on me for stuff they need, I'm only a fifteen year-old boy, i feel like an adult. I've learn to cook, clean, sew, babysit, laundry, mow the lawn, groceries, pet care, and get badgered when something isn't done or something isn't done right. Now, I make sure EVERYTHING IN MY LIFE is perfect, and if it isn't, I'm deeply disappointed in myself. I'm always nervous around my family because something is bound to get ugly. Now, I worry about everything 24/7, some things that aren't even bound to happen. The most disturbing and twisted words, subjects, and images pop in my head, and I can't help but dwell on them, and still do. Panic attacks have become a regular thing for me now. I was deeply depressed from 8-14 years old. My friends got me help when I started thinking of suicide. I didn't tell my friends and they never found out about that. I've had trouble sleeping, worries, and panic attacks since I was maybe 10. I haven't trusted my dad since I was 4. i'm losing faith in my mom. My grandmother, who is the only one that understands me is in the hospital, my siblings drive me to drink. I apologize to everyone, even when they tell me it's okay or I've done nothing wrong, I ignore that. When I don't do something close to perfect, someone compliments me, I either block out their comment or contradict their comment. It's to this this point that I have GAD, OCD, and if I don't do something about it, and I'd hate to go back to feeling that way, I'm on the brink on falling back into depression.