Immature ass adults

How, legit how have they made it this far in life. I’m 19, and all of their problems, issues, everything gets shoved onto me. They owe me a couple grand, They vent to me about how they want to Kill themselves, My moms physically and mentally hurt me, my step dad is some what emotionally mature but not a great parent. My mom threatens to OD as if I didn’t watch my Bio dad suddenly just die out of fucking no where because of drugs, like yay mom thanks for acknowledging my ptsd and trauma and turning it into a fucking joke. She’s a narcissist, always the victim. Any conversation turns into “oh i’m sorry im such a bad mom you’d be better off without me” like please for the love of god wake up and step up. i’m tired of coming home to see her drugged out of her mind. i’m tired of hearing fighting and trying to keep my brothers out of it. i’m tired of her complaing about working her part time job while going to school while I go to school and work almost triple the amount she does. and then she’ll blow up in my face out of no where saying she “should be doing what i’m doing and that she’s sorry she’s such a shitty parent” and then do nothing about it! Like hello?? you can acknowledge your wrong but you won’t try to fix it? I’m so tired i’m so so so fucking tired. my friends family has offered me a room after my mom and step dad almost made me live in a run down shed (with mold in it) and i’m so close to taking it. i’m so close to asking my grandmother if i could rent out her basement. anywhere but here. i’m so drained and so tired and I can’t do this anymore. I can’t keep parenting my own fucking guardians. I’m so sick of breaking up fights, bringing them to reason, it’s so fucking exhausting. they’ve screwed me over countless times and they have no remorse, they’ve stolen from me, they’ve hurt me, they vent to me about how they’re gonna either kill themselves, run away or get a divorce. like i’m just trying to make it through college while working two jobs bro 😭. it’s not like they have to pay for my college, I mainly eat while i’m at work, and i don’t ask them for anything. i’m not a hard kid to take care of, but they’re hard people to live with. I love them and I always will but i’m so drained dude.