Not sure how good this will do but here goes..
My mom used to do the same shit, and I wouldnt know what to do. I'd sit in my room all the time, skip school, get high and just spend days without eating or leaving my room except for using the bathroom, just to avoid seeing her.
I had "friends" but they were and are nothing but losers like I was. I didnt have anyone else to go to but my dog.
Everything seemed hopeless.
But I have recently come to the decision to make my life better for myself and my boyfriend.
I am 21 now, but I dropped out of school in 12th grade so I have trouble finding a job but I am striving to get my GED and get a job and go to college.
What I'm getting at though is I've been through hell and back (lots of stuff obvs dont wish to share)
And dealing with my moms bs, being an only child and having her eventually steal and get away with 15k of my money, all my money (she was vice president of a bank) and moving away leaving me to go to my father whome has never been in my life before and is as immature as konohomaru but I at least have a place to stay and sleep and have enough hope, more hope than I have ever had in my life, to do what is best and to truly be able to saythat everything will be alright.
So don't worry. Life will shit on you thousands of times, friends, family etc.
but no matter what, don't lose hope.
As shitty and cliche a saying it is, It gets better okay?
Just take deep breaths, lay down and think about what really matters and how all this is only a minor setback.
You will get through this.
Also dunno how your dad and bro are but if youa are able, see if you can talk to them. If not, I'm here and I'm sure your frieds are as well.
Chin up, bro.