As Gumbymom’s stats show, you should be able to get into some UC schools, but most likely not the most competitive ones. (However, there is absolutely nothing wrong with the less-competitive UC’s - they still provide an education that’s in a league with many states’ flagship universities.)
You will also have options within the CSU system; you’ll just need to calibrate your targets based on the major you apply to.
What is your budget for going out of state? Does your suggestion of Georgia Tech mean that you’d be able to afford the ~50K/year that Georgia Tech would cost for an out-of-state student? I don’t think your stats are competitive for GT specifically, but there are some great schools in that price range that you would be competitive for, such as Colorado School of Mines which is fantastic for MechE and good for CS as well. If you would enjoy a close-knit STEM school with lots of gorgeous nature and cool traditions, it could be worth a look. But like GT, it doesn’t give financial aid to out-of-state students.
For more of a bargain price, there are some excellent engineering schools that are part of the Western Undergrad Exchange. With the WUE discount, there are some out-of-state flagships and other top state schools with excellent engineering that you can attend for less than the cost of a UC. These would include U of Nevada (both campuses), U of Utah (excellent engineering and CS), Colorado State, Washington State, and U of New Mexico. All of these have Honors programs that provide added perks.
But it all depends on your eligibility for need-based aid; if your Expected Family Contribution is under $30K or so, then you’d get a better deal in-state, or at a private U that meets full need.
Have you ever looked at Rochester Institute of Technology? In addition to great engineering and CS, they have one of the top photography programs in the country, including several science-specific tracks like Biomedical Photography, Photographic Sciences, and Imaging & Photographic Technology. It might be worth browsing the RIT site for programs of interest, as you’d be a competitive applicant there and they have amazing co-op programs and majors/minors that blend technology and the arts.
You have a solid record and would be well qualified for many schools, but it would save a lot of bad suggestions if you gave a little more information on your budget and financial aid eligibility, and the kind of settings you like. (Bigger/smaller schools, urban/suburban/rural, region, etc.)
Don’t worry too much about the AP tests. Colleges know that some AP classes are better taught than others. What it mostly means is that if you plan to take more chem in college, skipping into the second semester of the chem sequence based on your 3 AP score could be a bad idea, even if the college allows it. Better to lay a strong foundation than to crash and burn because of weak preparation. But if you major in something that doesn’t require you to continue in the subject, and they give you credit for the 3, take the credit and run!