Getting Bs is not underperfoming.

So you not getting As. So what? I don't know how it works in the USA, but when me and my friends went to job interviews never once we were asked "what grades did you have?". You probably care for the grades more than the rest of the world does, much to your harm.

Grades are indicative how much the education system fits you. I had friend on International relationships who had As, but she was as clueless as clueless goes beyong what she memorized from the books. She would says in India they speak Indian and in Iraq they speak Iraqi. Couldn't decide what school of thought she falls in, not because she had open mind, but because she simply couldn't form an opinion on anything.

What is gonna harm you much more than some stupid grades in your career would be your low self esteem and self-torturing yourself over things that don't matter that much. That is somethign to work on with your therapist. And f the grades. Bs are good enough.