From what I’ve gathered so far from your threads, you have nothing to worry about. It’s not like you are some first generation poor black kid from inner city slum who is scared and feels like an imposter as he never had an advance class or opportunity in life. It doesn’t matter if you had AA advantage for admission, you have ability and resources to do well.
You have two Stanford educated parents, at least one of them has a PhD, rich grandparents, brother is an expensive prep school. You have more than $200K in your college account even though your mom spends lavishly. You have a full ride at UMD and some 20k/year FA at CMU. You took many AP courses, have a high SAT score, inflated but good GPA, participated and won in diversity science fairs. No need to feel insecure. You are over privileged not underprivileged.
If you want to be a big fish then just go to UMD, save money and live happily. As you mentioned having a therapist and getting blamed for aggressive behavior in past. It may better to go to a low stress environment. CMU is an intense place. Discuss it with your parents and therapist.