Nothing wrong with being an actor. Its a difficult career to make your way in, but even if you don't make it a profession it teaches valuable life skills: confidence, networking, speaking in front of people, improvisation, memorization. Join a drama group and you'll find out quickly if its for you.
Modeling can be a great way to make money for as long as your looks hold. Hard to get into, almost impossible to make a career of. And there are different types of modeling. But if acting can help self confidence, modeling can hurt it.
Art is a broad category and an art degree has a wide variety of careers available beyond "just selling artwork online": graphic design, art direction, illustration, etc. Even fine artists must market themselves beyond just putting up an Etsy page.
Pursue your interests whether or not it leads to a career. And get a job of some sort for the summer when you able, so you can learn to work. You've got plenty of time to figure this out.