I kind of have the same issue w/ my father. It seems that your issue is deeper than "I'm sick of dad treating me like a 13 y.o." kind of thing. I sense that you are more upset about him not giving you EMOTIONAL support more than financial or any other kind of support. I know what you are going through.
I think the majority of the people who posted on this thread COMPLETELY missed her point.
And, about this belief of anyone above 18 who does not support themselves is "morally apprehensible"
is total BS. People mature at different ages. I've known 16 year olds who could pull it off, and 26 year olds who couldn't.