Yes, it is possible to get into college with average grades. Depending on what colleges you are looking into, they may also take into account your SAT scores, ACT scores, personal statements, common applications, and extra curricular activities. Although your grade point average may be average, there could be other things that make you stand out. I am also from San Francisco, so getting into colleges can be quite competitive. I would suggest you apply to the colleges that you are interested in (and some back up colleges), and see if you get accepted to the colleges you wanted. If not, you can go to your back up schools or community college.
Community college is always a great option because you can stay there for two years, then transfer to the college you truly want to go to. At community college you would have a chance to redeem yourself, you can work hard to achieve a better grade point average. Also community colleges have programs that allow you to easily transfer or guarantee a transfer into certain colleges. In the end, you do not need to stress about it too much as you can make yourself stand out in other ways and you always have back ups. Good luck and I hope this was helpful!
To succeed in college, you will need to:
* be disciplined around your studies, submit assignments on time and do your best work
* seek assistance where and WHEN needed (many colleges have Academic Success Centers, students hold study groups). If your grades were average, there may be subjects for which you may need just a little extra help.
* understand/leverage the strengths you acquired in your extra-curriculars
You should also consider going into a trade! There is a big demand for work like this now and you can make a great living, sometimes 6 figures in just a few year. So if you like working with your hands that might be a great option for you. Courses are offered at most junior colleges our you could seek an apprentiship at a local labor union hall. Good luck!
Important for you to keep in mind that there is no "one size fits all" where college is concerned. That, in my view, is one of the many awesome things about going to college. It is one of the first places where I learned about what works well for me and what I needed to do to graduate and build an career.
What you may consider as "average grades", may actually be the type of grades that allow you to excel at a particular college/university. So yes, absolutely! you can make it to college...and you can graduate...and you can build a great career, as the previous answer has given some guidance on.
I hope you find this answer helpful and best of luck to you!