My struggle with morality

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I find myself in an inner struggle. One where if I follow my morality it will end up ruining my life. However if I choose to not follow it, it will destroy my sense of self worth.
I want to go back to college and do something with my life other than work whatever manual labor jobs are around. I currently financially support an alcoholic father who seems uninterested in taking care of himself. I have been paying $500 dollars a month for as long as I can remember for cigarettes and alcohol in addition to paying the household bills, while he spends his money (self employed) on his own interests (guns, relatively expensive ones). He's in somewhat bad shape and I don't know what kind of job he'd be able to handle, he has a vocal disability making it difficult for him to speak and several injuries he's neglected over the years that cause him a lot of trouble. Do I leave, and hope he will develop the willpower to look for and find a job, or work enough at his job to survive allowing me to start my life at 25? Or do I stay and take care of him, and continue to throw away my chances of happiness?