You did fully support yourself if you used student loans to pay all of your bills and you are correct they will have to eventually be paid back.
However, student loan income is not taxable nor is it considered earned income for the earned income tax credit.
You may not even be required to fil a tax return although there could be a benefit for you to file based on your specific situation. You could qualify for educational credits depending on if the cost of going to school was covered by scholarships and grants or if it was paid for by student loan proceeds.
