OP, you do realize that Williams is considered a little Ivy?
The problem with being a first gen is you don’t know what you don’t know (I know). UCB is a great school but you’re one among many. At a school like Williams you will get individual attention most other kids dream about.
Counseling, tutoring, professors that want to teach, funding, advising and many other perks. Unless Williams is absolutely a bad fit please take advantage of this opportunity.
There are many, many paths to be successful in business. Attitude, personality and work ethic trump what school you attend and which major you pick.
Good luck.