Each UC campus determines their own criteria for selecting Regents so you cannot make a blanket statement that you might not be get Regents or you are not a competitive applicant. UCB is the only school so far that has asked for Regent Interviews which does not guarantee Regents at that school. UCSB just started sending out Regents and UCI has not sent any Regent notifications yet so I think you are jumping the gun.
You look like a very competitive applicant but each school is looking to fill their classes with a diverse group of students so not all schools are looking for the same type of applicant.
Regents is only a small percentage of accepted students, so you still have a decent chance for an acceptance at UCB and numerous other schools. Be patient and wait until all decisions are out before worrying about if you are not competitive or how you compare to your fellow students.
Best of luck.