If you are a US citizen, then you are not an International student/applicant. You would be considered an OOS applicant and would pay OOS fees. If you want establish California residency, you and your parents need to reside in California 366 days prior to attending a California public university and show that CA will be your permanent home.
The link to establish CA residency is posted above ^^^. Coming to California for the purpose of an education will not get you California residency.
UC admission decisions are made in March for the following Fall class so if you wait to see if you are admitted to a UC, you will not be in-state for the required time to establish your residency.