In order to claim Head of Household, you need to be
-unmarried or considered unmarried, meaning separated, divorced, or living apart from your spouse for at least the last 6 months of the year,
-pay more than 50% of the cost of maintaining a household for the year, in which a qualifying person lived for more than half the year.
Household costs include rent or mortgage payments, utilities, and other things specifically related to the residence.
One or both of your parents could be the Qualifying person in your household if you are claiming one or both of them as dependents.
From the IRS: (The following points note that there are special condition for your parents but they don't apply to you because you live with your parents.)
You may be able to file as head of household if
you meet all the following requirements.
1. You are unmarried or considered unmarried
on the last day of the year. See Marital
Status, earlier, and Considered Unmarried,
later.
2. You paid more than half the cost of keeping
up a home for the year.
3. A qualifying person lived with you in the
home for more than half the year (except
for temporary absences, such as school).
However, if the qualifying person is your
dependent parent, he or she doesn't have
to live with you. See Special rule for parent,
later, under Qualifying Person.
You can use the following link to go to the same Publication from the IRS to read more if you like:
https://www.irs.gov/pub/irs-pdf/p501.pdf
