As far as U.S. taxes are concerned, you are not a dependent. The question is not always asked with precision, but the question is really whether you can be claimed as a dependent by another taxpayer. Your parents are not U.S. taxpayers, and they are not required to file a U.S. tax return, so even if they support you, you should not say that you can be claimed as a dependent.
You said you are trying "to use a free tax filing software." Are you using TurboTax or some other software? This is the TurboTax support community. If you are not using TurboTax, we can give you only very limited general advice. We cannot help you with other software.
If you are trying to use TurboTax Online Free Edition, it can only be used for very simple tax returns. Your situation as a full-time student with no income from working may require things that Free Edition does not support.
If you are not working, why are you filing a tax return at all? Do you have income other than from working, such as from investments or taxable scholarship income? If you don't have any income there is no reason to file a tax return. There is an old urban legend that a college student can get $1,000 just for filing a tax return, but it's not true. If you do not have any income from working, you are not going to get any money.
You can use Do I Need to File a Tax Return? on the IRS web site to see if you are required to file a tax return.
Your descriptions of the questions you are being asked are somewhat vague and imprecise. If you need further help to answer specific questions in TurboTax, please post the exact wording of the question, and what topic or section of TurboTax it is in. Also tell us your age at the end of the year that you are filing for.
