I’ll add to @bluebayou’s comments:
You have to be independent and NOT have attended school. The UC’s are strict. Once they note that you were not educated in California for high school, they will follow your paper trail. (Community colleges run their instate statuses differently.)
If you came to California and immediately attended a community college, then you entered the state for educational purposes. That means non-residency status for your future complete time at a UC or a CSU. You entered the state to attend our public schools. Your family did not have a history of paying California State taxes for year, like the rest of us residents.
My daughter lives in San Francisco and goes to school there (in the city). She (we)pays $2500 per month for a shared one bedroom studio. They have a bunk bed because there is not enough room for two beds. Yep, that $5000 for a 1-bedroom. You will need a deposit and 1st/last months rent and a high-paying job.
@ProfessorPlum168 is spot-on about your probable living situation in the city.
Chula Vista is NOTHING like the city of San Francisco in terms of rents.
Also, you may want to “adjust” your elitist opinion of the CC’s in SD county.
Every CC is different. Did you already explore the options in other parts of the county?
Cuyamaca? Grossmont? Mesa? Miramar? Palomar? Mira Costa?
All 3 of my children took classes at San Diego county CC’s during their summers at home. My son (Caltech) commented that he met local students from UCB, UCLA, USC at his summer CCs, taking units to augment their coursework at their schools.