I’ve listed a few CSU’s that offer both psychology and music, you won’t need to worry about your SAT, and the cost is reasonable. If your parents are worried about a supportive environment, have them look at the academic support programs.
East Bay - They have a program called Project Impact that provides additional wrap around support. If your LD falls under the ASD diagnosis, there is also the LINK program. That one fills up, so it is better to apply early.
San Bernadino - They have the SAIL program in addition to student mentoring and tutoring.
Northridge has robust Disability Resource Services and offers a “journey to success” plan.
Keep the costs low, because after successfully completing undergrad, you might want to apply to a program like Lesley University’s program in clinical counseling and music therapy.