Hi Rayne, I can see how things are really piling up for you, I'm sorry
Maybe if we break things down a bit though, hey??
As for your dad, I think you've already realised that he isn't able to be a dad in the true sense of the word, right now?? So the less you can rely on him or hope that..........the better for now?? You could try writing him a letter pouring everything out to try to give him a "wake-up call" but I'd say that the more ways you can try to stand strong without him might be more helpful.
I would suggest contacting AlAnon (or Alteen depending on your age) for some support though, including support from people who "are there" or who have "been there" and you can do that online too........they are supposed to be so good.
For the therapist though.........some will work on a sliding scale of payment, maybe there's some in your area if you check around. Because even if your mom didn't have all this going on and was able to be there for you.........then sometimes it helps to have a professional or someone "neutral" to talk to anyway. And even if that needs to be through a helpline. Although that's not to say that you shouldn't be pushing your mom a little for a bit more emotional support.......she is still your mom so she should still be making some time/space for you too.
About your brother.........that's got to be distressing for you too, hey?? And sometimes however much you want to help/for things to be different there's only so much you can do. Depending on the relationship you could maybe try to be there for him, and let him know you need his help too........sometimes with a focus on someone else and with the opportunity to share feelings it can help...........meaning it could help both of you???
And school.........Rayne!!! give yourself a bit of a break there, yes?? Wow, you've got so much going on for you, if you aren't doing well, or have to postpone then that's completely understandable!! And you shouldn't feel bad about it!!!! Just do what you can, OK??
If you can get a positive out of it by throwing all your focus on the work as a distraction from other things then great, but otherwise got to put yourself first, right?? And the less pressure, the more that might help.
And the boyfriend.......well I'd say the most important thing now is you......and if he needs to be out of the picture/if he's only making/going to make things worse......then it might not be what you want, but it could be what you need. Really you seriously have enough going on right now so you can do without him adding to it. Remember, put yourself first!!!
So maybe a heart-to-heart with him and see where it goes.........just remind yourself though you can be OK without him, if you need that.
And as for needing to share what you're going through, you have always got us!!! Whatever happens, whatever's happening
Alison