Child. What Akgogirl and Amy said.
And. Why are you putting up with this insane situation?
Those **bleep** ghosts need to materialize and step up.
Your father is ill on many levels, and if he is addicted to pain medication, then his lies and mood and manipulations and shopping addictions are all part of his addiction. Hard as it is to do, please don't take his horrible new personality PERSONALLY. Do not. And if he is not addicted to pills, he is still being a terrible person. Do not take that personally either. Easy to say, hard to do, but ESSENTIAL for your mental health, physical health, educational future, relationship with boyfriend, financial security.
There are several ways you can get out from under this situation. You can move out with your boyfriend to another place. Let your dad assume all his responsibilities and eventually he will fail. Perhaps he will hit a kind of bottom. Perhaps other family members will finally step up (you need to inform them all.) You do not have to work in isolation and try to be his doctor/ manager/ housekeeper/ psychotherapist/ cook. I mean really. There is no where written that adult children need to martyr themselves, their future, mental health, finances, etc, for their fathers or mothers. Honor thy father and mother can sometimes mean walking away from their craziness.
Therapy. Find a therapist and go. Regularly. He or she will hear you and immediately know that you are over your head and need coaching and help to get out from under.
He definitely needs a thorough assessment by a physician, preferably a geriatric internist, but someone who will see all his meds, look at his history, including wrecking a car, and get him on a path to recovery of mind/body/spirit. that is not your job. you can help, if you choose to. if he'd been arrested for having drugs in his system at the scene of the accident, he'd be mandated for drug treatment. but in any case, if he refuses all help, its up to him. he has the right to make bad choices.
Get out. If you don't move out, then 'separate' as much as you can, including finances. Pay off your credit cards. Take care of yourself. Yes you should go to college. Community colleges are a great way to start while you are also working.
Please respond to our posts. Thank you for being so candid. If you react to what we've written we can bounce around more ideas for you. I feel very angry about your situation on your behalf. Please write back.
Jane