@bindirick If you put down you were a dependent and you don't qualify as a dependent it can effect several things on your return. One major thing is you might get the full Standard Deduction (if it was less) which can reduce your taxable income, so you would owe less tax.
But just because they didn't claim you, you still might qualify as their dependent. When do I have to answer YES to being claimed as a Dependent?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/answer-yes-claimed-dependent/...
See if you qualify as a dependent. IRS Publication 501 starting on page 11 Dependents
https://www.irs.gov/pub/irs-pdf/p501.pdf
