Time to look forward and not backwards. Focus on your great acceptances. Choose one of the amazing schools you got into and have a great college experience.
I got in Berkeley, UCLA, UVA and UMich but was also rejected by USC. I was shocked by the rejection but it doesn’t really matter to me. You already got great schools. It’s USC’s loss to not have you as its student. USC probably already predicted you won’t go because you’re overqualified 
UCLA is a difficult school to get into. Be proud of your achievements.