Well, @Kelvin82 , one step in narrowing things down is deciding what range of options you need. Especially, do you need a school that has engineering programs, or not necessarily? And conversely, could you get a wide enough range of options at a school that is primarily STEM-focused?
@CADREAMIN is absolutely right - you’re letting the achievement-inflation mindset psych you out. You’re doing great - keep developing your strengths and bringing your interests and passions into focus, so you know what you are looking for and so you don’t get sucked into excessive preoccupation with who is or isn’t looking for you.
That said, I definitely understand that financial pressures amplify all of these concerns, because you not only have to find a “fit”, you have to find a fit with funding. You’re right to plan ahead and think strategically, in order to make this happen. While you should qualify for a good aid package at a UC or CSU, it really can be true that private colleges farther afield can end up offering a better deal, both because of their commitment to meet full need and because of their desire to attract students who will enhance the diversity of their student body.
As this thread has already covered, Questbridge may very well end up being your best bet. But also think through what kind of schools have the greatest shortage of students like you. Hard as it is to believe, growing up Asian in California (my own kids are Eurasian and can barely fathom that there are parts of the country where this rates as unusual), there actually are schools where this will give you a boost… but not on either coast. Lehigh (in Amish country in PA), actually includes CA Asian kids in their all-expenses-paid “diversity” recruiting events. I have a friend, of South Asian descent, who once lived there while her husband was teaching at the university - she recounts being literally unable to find a store in the Lehigh Valley at which to buy black bobby pins. That was some years ago and has likely changed, but nonetheless - there are places where you are an underrepresented minority. (And Lehigh is an excellent STEM school, and also has some great interdisciplinary programs that might span your interests.) Your visual disability is another diversity factor, and if you are sufficiently STEM-focused to consider gender-skewed STEM schools, being female can be too. (Check out Rose-Hulman’s Operation Catapult summer program. You would have to find local scholarship funding for the $2750 cost, but attendees are offered significant automatic scholarship $ if they attend the school, and it’s a fantastic summer STEM program. Also, being a midwestern school with a shortage of both women and Asians… this is the kind of college that might really go out of its way to make things work for you.) Does your high school participate in the Rensselaer Medal program? (If not, they can sign up to do so.) This is awarded in the junior year of high school, and makes you eligible for an automatic $25K/year scholarship at RPI, special recruiting events, etc. etc. This is another “it helps to be a girl” STEM school.
Anyway… keep doing what you’re doing as far as looking ahead and getting your ducks in a row, but don’t panic - it’s the kids who are not doing the legwork you’re doing now, who will have reason to panic later. 
