Most students including both my daughters change their major after starting as a freshman in university. When I graduated from university (as a math major) I still had no idea what I wanted to do for a living. We all figure this out over time.
It sounds like you are doing well. Keep you grades up. Participate in the extracurricular activities that you want to participate in. Whatever you do, try to do it well. With this you will be fine.
Are you in-state for the UC’s? If so they are are great schools. If not they can be expensive for out of state students.
Also, learn to write in paragraphs! This will be useful regardless of what path you end up taking in life.