Can you say more about why you are not enjoying your time at UC Riverside? Do you want to be in different setting? Do you miss home? Have you joined clubs or undertaken other activities outside of classes?
You university GPA suggests that the classes are approximately an appropriate level of rigor.
UCLA looks like a high reach to me, but @Gumbymom would know better than I would.
What do you think that you will like better at UCSD, UCSB, or UCI?