I'm very confused.

My sister is not my sister. She acts as if we are the biggest enemies on Earth. She will never do anything for me. Every time I ask her to do something for me, she says 'Why? Have you done anything for me?' And really, I don't do anything for her. But I'm not God, I don't know what she wants from me. Well, she tells me she wants me to sleep early and wake up early, but honestly it's not my fault I have insomnia. I'm trying to control it, and it's just not happening. I have too much to think about to be able to sleep. FYI: It's called mental stress. And I'm not even stressing about myself, it's about everyone BUT me. Another problem is that I'm homeschooling, so I really don't have a reason to wake up at like 9 am. I'm the type of person that even if I get a full 12 hours of sleep, I'll need and want more. I'd rather dwell in my dreams than reality.
I need some advice.

Then there is my family. They all treat each other like dogs. Seriously, it's like they HAVE to bark at one another every second of the day. It really hurts. Why can't I just have a normal life?

After that is my upcoming surgery. I'm freaked as hell, and I'm so happy my aunt's going to be here, even though she's going to be leaving 3 days after my surgery. But that's enough time for me to heal. I know if she weren't here, my sister would not be able to take care of me. She'd let me rot in my own shit if I were that dependent on her.

And finally, my constant flashbacks. I swear they are driving me insane, which is why I'd rather sleep than stay away. I wish I could forget all that. I wish there was some sort of power on Earth that could take my memories away from me. I've lost my appetite, and basically have gone to hell and back because of my flashbacks. It's like, I know what it was like seeing my mom murdered ok, why the constant reminders?

I'm so fucking sick of all this crap.