I want to be an art therapist. Should I major in art or psych? I'd minor in whatever I don't major?

All colleges and universities have career guidance counselors and this is why. Make an appt and go talk to yours.

"Art therapists are required to be certified by the Art Therapy
Credentials Board (ATCB). After earning a master's degree and fulfilling post-graduate art therapy experience requirements, new therapists are eligible to earn a credential to become a registered art therapist (ATR)."