When you apply to either medical school or law school your high school grades will not matter at all. There are a lot of universities that are very good for premed and pre-law students and your grades will get you into many of them. However, a 3.19 unweighted GPA in university is not likely to get you into medical school or law school, and university classes are likely to be more difficult than high school classes. You are going to want to get a higher GPA in university than you have managed so far in high school.
Your number 1 job right now is to lean how to be a stronger student. You can start this effort in high school with the expectation that this will continue through university. You need to attend every class, show up early if possible, sit near the front in every class if possible, always pay attention, and make a very strong effort to stay way ahead in both studying and homework assignments. Starting homework the day that it is assigned is likely to be a good plan. If there is anything that you are unsure about look for help early.
I have seen it happen. It will take a strong effort.
And I am curious about what you do not like about UC Riverside.