First of all congrats on your accomplishments! UCLA alum here. If you loved the thought of Berkeley this would be a no brainer. But the language you use (“bores me”, “could come to love Berkeley”) indicates you have your heart set on UCLA. Follow your heart.
Can you handle Berkeley? Absolutely - that’s why you were accepted and given the Regents Scholarship. But will UCLA be a career-diminishing choice that you will somehow regret later on? Absolutely not.
Being happy at college is critical to your success in the classroom. Plus, you may find all sorts of connections to a career in SoCal during your time down there. You should go to the school that you feel is the best fit for you. Bottom line.
Good luck!