Why am I going in circles?

I've suffered from depression since I was 12 (currently 16) But over the years I've gotten better gradually, and things have started to sort themselves out. Lately though, I've been extremely non-productive and just over all depressed about everything. I feel so overwhelmed, and I think it has a lot to do with my family since my family has a lot of issues -my mom hates her job, and she's always really angry and upset about everything. My brother has always physically and verbally harassed me, basically makes me feel even worse about myself. No point even mentioning my 'dad'. I understand there's a lot of people out there who have it worse off then me, and maybe I'm selfish, but I feel so alone with this and every time I try and fix things I get upset and screw it up. And I've been hurting myself, not like cutting or anything but when a teacher is upset with me or my brother has said something I over eat until I feel like puking, or I seclude myself in my room and go over everything I've done wrong. I want to get better so badly, and I have all these goals but I just never get anywhere with it. I don't have any friends, or anyone to talk to anymore. I just want to know how I can stop being so sensitive and move on because it's really crucial for me to stop this.. I've been considering pills for depression, but I can't help but think there's a better way to resolve this naturally.