Well, skippy, I do vote and I don't go to university. I am a real adult. I actually work.
When trying to convince others that you are “a real adult[,]” it’s probably a good rule of practice to avoid remarks that make you seem like a petulant child.
What you didn't explain is why my taxes should go to something that will not benefit me or the rest of society. Explain why my and everyone else's tax dollars should go to paying someone's college tuition for an education that will benefit only that third person?
Florida residents are subject to and bound by the laws of the State of Florida. Except where federally preempted, the supreme source of law of in Florida is the Florida Constitution. Article IX, Section 1 of that document provides, in pertinent part:
The education of children is a fundamental value of the people of the State of Florida. It is, therefore, a paramount duty of the state to make adequate provision for the education of all children residing within its borders. Adequate provision shall be made by law . . . for the establishment, maintenance, and operation of institutions of higher learning and other public education programs that the needs of the people may require.
Art. IX, sec. 1(a), Fla. Const., available at Flsenate.gov (emphasis added).
In other words, the simplest answer to your question is “because it’s the law.” If you don’t like it, you are free to (a) relocate to another state or (b) avail yourself of the provisions of Article XI, Section 3, which sets out the method by which citizens such as yourself may propose amendments to the Florida Constitution through ballot initiative. Whining about your taxes here is the coward’s option, and wholly unpersuasive.