Whoa, slow down! You have got a whole lot going on in your life. It is no wonder you are feeling so stressed.
Which things can you change and which things can you NOT change?
FYI -
Many people who go to college for a four year degree take
at least five years to complete the classwork. Perhaps you should drop a class or two that you are failing and concentrate more on the ones you doing okay with.
You can't change that your parents were bad parents. You can't change that your mother is inappropriate now but you can change how you respond to her. I know you care about your brothers and I'm not sure exactly what the best way to change your response would be but perhaps you could talk to a therapist?
I can understand your frustration.