I'm afraid for better or worse parents have a huge influence on a person, and when you see them make a hash of their lives it does seem the the future is bleak. How different it would be if they took your feelings into account, and also the feelings of each other.
Love sounds a scarce commodity in your household, you love them, they do not seem to return the feeling. You also appear to be treated without any consideration, both matters that have a huge effect on a person.
So you are presented with a picture of a future no sensible person could accept or want to have happen to them. It is no wonder you lose enthusiasm for your homework or anything else, after all it is easy to forget the point.
My own parents ended up demonstrating they had no love for me, and out of that I found I had an exact pattern of how to have a relationship and be a parent. I simply had to try to do the opposite of what they did. And it has worked well.
Even now you can see the futility of arguing and ignoring each other. Sadly such maturity is hard won, as you know.
I"m sorry that one of your main outlets to get away in your mind is stopping for the winter. Is it possible you can find a substitute?
You did mention you had good friends, and maybe now is the time to lean on them more, not necessarily by discussing your problems - though that can help too sometimes -but simply by being with people who lead calmer lives and enjoy being with you.
Can I ask if there is anyone in your family who is sensible, understands and cares about you?
I read Sophie_M's reply to you a while ago and think her advice to contact the Kid's Help Line when you are upset by all this by phone or web-chat is an excellent one. They are very experienced and can be a real comfort. You can contact them more than once
or 1800 55 1800
If you would like to come back and talk some more that would be great