It would really depend on if you're still considered your parents dependent (i.e. do they still want to claim the tax breaks for you?), or if you're an independent student. Plus, if you're only 18-19 and this is your first year in college, you're probably still going to be dependent on them. You'll be considered 'independent' if you had already finished a bachelor's degree and were going into grad school.
If you're living with your parents, (that is, if they maintain a room for you when you're not away at school), then you ARE their dependent and you don't (and shouldn't) get as much aid as a true independent student. Many of your classmates are going to be older than 22, they won't be living at home or getting checks from parents, and their parents won't be the ones taking out PLUS loans for them----- those are independent students, and those are the ones that the aid is designed to help.
Don't fudge on your FAFSA paperwork just because you think it will mean more aid for you. There's a very important bit of information on that paper--- your signature, stating that everything is true and complete to the best of your knowledge. That's your measure as a person, your word.