It always surprises me how often the advice on CC is to sneak around the parents or just apply to colleges without letting the parents know. I’d be furious with any teacher or adviser who suggested my kids just do whatever they wanted without letting me know. I’d be furious with my kids for sneaking around, and at that point I’d be a lot less likely to help them in the future.
I also do a LOT more for my kids than just filling out the FAFSA. I’ve found scholarships for them to apply to, figured out ways to apply their scholarships and grants to stretch the money, arranged medical insurance to save money, suggested taking an extra class (one daughter gets money per class), dropping a class (other daughter pays per credit, so pays more if she takes 17 than if she takes 14). I arrange transportation (and pay for it). I had to sign some documents/leases as one child was 17 when she started college. I’ve filed appeals for FA because awards are based on MY income. The OP is applying to schools that also require the CSS, so her parents will have to do more than ‘just the FAFSA.’
If the OP doesn’t want her parents involved, then she needs to wait until she’s old enough to do college without her parents. Sneaking around won’t solve her issue of her parents not liking her college choices. I suggested (and suggest again) that she get her parents to understand how great the colleges he/she has picked are, and how they can afford them with little in loans.