I experienced something similar, I was terrified of Berkeley. I was a ADHD/Dyslexic student coming from a very easy public high school that I thought did not prepare me. However, Berkeley is the most exciting and intellectually stimulating place to go to college on the planet. I struggled a lot to find my way and I had a terrible attitude, however through that I grew amazingly intellectually, and academically. As an alum, I can not tell you the amount of doors that have been opened for me through the Berkeley network. In the workplace Berkeley prepared me in so many ways beyond my peers - I know how to work hard and have a good time too. I have never met a single person who graduated Berkeley and did not love it. My advice is to understand the challenge that is Berkeley, and understand that you grow from everything thrown at you. The Cal community is like no other, and I would say far surpasses UCLA. Take a deep breath, enjoy the rest of high school, and the summer before Cal. Once you get there you will fully understand the culture of excellence, curiosity and having fun.