You are extremely competitive for medical school, especially as a low SES, URM veteran. Aim high, you are definitely competitive for top tier schools. If you are open to metro areas, you could definitely apply to schools like Harvard, Columbia, NYU, etc. Make sure to balance your list with some solid mid tiers and to apply early.
In terms of the UCs, I would only caution that UC Riverside is a mission driven school. They want applicants who are from, have shown a commitment to, and would like to practice in the Inland Empire.