The first thing, as I am sure you know, is your mental health. You should take advantage of all of the counselors and health advocates that you have access to.
Once your mental health is under control, and you have the energy to spend on your studies, you should work with your teachers, guidance counselor, and whatever kinds of tutoring help you have access to so that you can begin to perform at your own best level. Lots of kids who do well in elementary school stumble a bit when they get to high school just because the work is harder, so that could well be part of what happened to you. Your teachers are there for you, so communicate with them and find out what you can do this summer so that you are ready for the fall. One resource I really like is https://www.khanacademy.org/ They have all kinds of self-study materials that you can use on your own to help fill in the gaps in your education.
Yes, you can go to college. However, you might find that you have to start at a community college and then transfer to a UC or CSU. Fortunately, in California you have excellent community colleges that offer clear transfer pathways. Since money is an issue, you should spend some time in the Financial Aid Forum reading up on how need-based aid works.
Wishing you all the best!