If your parents claimed you as a dependent, then you must indicate that they did when you file your tax return. Since you were living with your parents for more than half of 2018, they may be eligible to claim you if:
- You did not provide more than half of your own support during 2018 and
- you were a full-time student for at least five months of the year and under the age of 24.
If your parents qualify to claim you, then you must answer yes to question number three in the personal information section of your return. Please view my screenshot below for reference.