Agree with @eyemgh.
The California public schools are full fees to nonresident students. That means that your parents would have to pay $65k per year. Scholarships are competitive and are minimal (~$2k-$5k per year). Remember that these are public colleges, relying on state taxpayers’ dollars to fund their large universities.
Being LGBTQ is not a hook. A hook is something the universities look for and need; something the university wants and you have no control over=URM, legacy, celebrity status (Bill Gates kids, Malala, Greta, etc), recruited athletes, children of billionaires who can donate $20 million dollar wings.
Generally, “first gen” goes hand-in-hand with “low income”. The universities recognize that a number of students have a disadvantage in that their parents never went to college anywhere. These students are ones where they’ve had to have help, from their high school staffs, in navigating forms and what classes to take in high school to go to any college.
Nonresidents often try to get into the Texas public universities because these schools are strong, recognized and exceptional. Texas makes sure they take care of their own first, and they limit non-resident admissions, so you are at a big advantage- doing really well- to get admission chances at a Texan school. Good Luck!