I have been on my own financially since age 17.
My mother became homeless, and went to live with her mother.
My father - somewhat famous in track circles, was horrifically abusive and abandoned the family.
I went to school on a track scholarship back when men received track scholarships, so I was lucky.
I never thought of smoking weed or drinking anything more than a minimal sip or two or letting my grades slip. There was no Mommy around to give me money or back me up. I had less margin for error, and damn well knew it. I actually was very fortunate in real world practical terms but did not think so at the time. I did not miss the money or financial support from my parents, but of course I really missed not having functional, caring parents to love. I made my own family.
The original poster here should have recognized that in fact he too, had little margin for error, and well, to act like it. I have trouble having sympathy for guys in this situation but I remind myself that living a life with supportive parents who start life on third base has its own set of problems. No one has a right to their parents money to go to college or do anything. Be responsible to the guy in the mirror, and do it well.