The way you feel is not at all uncommon. You have likely grown up in an environment where your family has enjoyed a particular lifestyle that would lead a young person to think that attending any college may be possible.
While your parents income is significant it is not significant enough to be in a position to afford privates unless they had lived well below their means and saved like crazy.
You are incredibly fortunate to have a debt free undergraduate education taken care of. That is huge and I believe strongly that a student should not incur undergraduate debt! No debt equals freedom and more choices to do what you want to do not what you have to do to pay the bills.
Given your interests you should have been strategically pursuing merit money.
If you can’t get your head around being in an honors program at your states flagship you are likely looking at a Gap year.
With no offense intended (how is that for a lead in?) big merit money isn’t easy to come by. You are going to be hard pressed to get the total cost of attendance at schools that are in the $60,000 range down to $25,000 a year. They look hard at standardized test scores and yours while very very good are not likely to have you qualify for most schools highest merit awards.
You are in an enviable position and have the luxury of a paid for undergraduate education, that is a big deal and something that you may not fully appreciate until many years later.
As someone who put themselves through college by attending community college for two years while working 30 hours a week and then went to an in state flagship while working 10 hours a week and 60 hours a week during the summers and had student loans that I paid off over 10 years my perspective may be a bit jaded.
All you have to do is go to school and focus on your studies, you are very fortunate.