Entertainment (at a *RESONABLE* amount for your income)
If you live with your parents, there's no question they provide you shelter and it's a fair bet they feed you to. If you are under the age of 19 what you make or what your provide doesn't matter.
If you are a full time student under the age of 23 your earnings dont' matter. You would be hard pressed to provie that you provide more than 50% of your own support. I seriously doubt it would be possible to do with your setup, even if you earned a million dollars.
There are those rare occasions which practically guarantee an audit with chances more than 90% the person being audited will be denied their claim of providing more than half of their own support.
Go to Page 15 of this IRS reference and you'll find a worksheet for determining "support": https://www.irs.gov/pub/irs-pdf/p501.pdf