YES, you do. I did the same thing--(was born and raised in CA), attended college on the east coast, and worked at the NIH as a post-bac pre-IRTA for about two years. I was accepted at a couple of the UCs and absolutely qualified for in-state tuition, etc. Non-residency never came up as an issue, although I was certainly freaking out about it at the start of the process as well.
Here's what I gathered from speaking to a few of the UC admissions offices when I began my application year:
You qualify as a CA resident if you:
1) Still have a CA-based bank account
2) Your parents still live in CA
3) Have a CA drivers license, are a registered voter in CA, file your taxes in CA
The more of the above conditions you can satisfy, the better off you are. I'm sure you'll be fine. Good luck!!