Sometimes it isnt bp or bpd. Sometimes a person can be genuinely stressed. If my mom kept telling me I was lazy and worthless, I would feel the same. The answer is not always "take medicines." A more appropriate answer would be to see a therapist. Schools should have a counselor so talk to them about stress management and getting into a good uni. Uni typically have affordable healthcare plans that allow you to see a therapist and potentially a pdoc.

When you are underaged in the US your parents are paying the bill and can deny you access to a pdoc. I didnt see one until I was legally an adult.