Start by reading through everything at EducationUSA | Study Abroad, Student Visa, University Fairs, College Applications and Study in the U.S. / America
. That will help you understand how college admission works here. If your parents weren't educated in the US, they will learn a lot there too. Then follow the links to find the Advising Center closest to where you live. The counselors there are expert at helping students educated in the country where you are now find good places to study in the US. If none of them have worked with a US citizen lately, they have colleagues in other offices who have.
You will be able to file the FAFSA, and you are eligible for federally determined need-based aid. That is a good thing. You also don't have any restrictions on where you can work. In some states it is possible to establish residence for in-state tuition and fees on your own. You would need to move to that state, find a job, and support yourself for a certain period of time. This is not possible in every state. Read the university websites to find out what their policies are.
The really big money for your education depends on your grades and your ACT/SAT scores. If those are good enough you might qualify for a full scholarship somewhere. There are several threads in this forum on merit-based scholarships, read through those for ideas.
There are a number of US citizens abroad who are active here at CC. When I can get to the other computer, I will send you a PM with some of their usernames. You can look for their threads, to get even more ideas.
Hang in there. You are not alone!