Based on what you described, you are not required to file a tax return.
The question, you didn't ask is: can you file a tax return to get the American Opportunity (tuition) Credit (AOTC). The answer is no.
There's a new urban myth among college students that says they can get a $1000 from the government just for filing a tax form. For most of them, they simply aren't eligible. A full time unmarried student, under age 24, even if you don't qualify as a dependent, is only eligible for the refundable portion of the American Opportunity Credit if he supports himself by working. You cannot be supporting yourself on 529 plans or student loans & grants. It is usually best if the parent claims that credit.
Reference: Line 7 instructions for form 8863. https://www.irs.gov/instructions/i8863
