Is it too late/impossible for me to transfer? If not, what are my chances?

maybe… you will never know unless you apply. Note though that UCs have a pretty narrow transfer window of 60 o 90 semester units. You will note that the acceptance rate varies a LOT by major.

https://www.universityofcalifornia.edu/infocenter/transfers-major

what are you hoping to get out the transfer?