Help me please! I feel like my mind is slipping away from my body.?

I've been on break from college for a month now. I don't have any friends so I'm really isolated. I go to work, and hang out with my mom & bro sometimes. My life is sooo wierd. I think my family & I are a bunch of losers. My bro is a veteran, and is a paranoid schzophrenic. He rarely leaves the house, doesn't take care of himself, he can be violent sometimes. He just plays video games and watches the same movie over and over again. He monopolizes all the tv time, pesters my mom, and I don't think he cares for us. My mom was working all of my life, but was put on med leave b/c of her severe arthritis. She just sits around the house all day. She's also an alcoholic. She's lived a hard life; I don't blame her. My father left before I was born, so she raised us herself and never complained. Now shes, on disablility. And it hurts me sooo bad to see her wasting away. What can I do for them? I don't feel like we belong on this earth. I feel like our lives are arbitrary.