I am sorry but everyone here has been giving crap answers. How in the world is a 3.8 GPA low? These commenters do not know what they are talking about. When I was a senior my unweighted GPA was exactly 3.7 and my ECs were not nearly as impressive as yours and I got into Cal. Given that your school only offers 5 APs (correct?) I think your GPA and course load is fine and also very unique.
However, do improve your SAT- you did fine in the reading but def get up in math- get a SAT tutor if feasible and do every practice test with problems you can get your hands on.
It seems like writing is your thing, so I am sure your statement was spectacular. Do not be discouraged by some of these extremely inaccurate comments.