[morbidhawk]

Exactly this! To improve a more critical thinking approach is needed. Learning to interview better is a separate issue from whether the interviewer or interviewee should be assumed incompentent. Asking "Am I incompetent" is a question that you can't control (right now you can only do something to change your future competence as the past is behind you) and it might be a passive-aggressive mechanism to protect yourself rather than addressing issues directly. OP, asking better questions will help focus your mind on achieving what you want. "What did I struggle with in the interview?", "Ok I struggled with x topic, what is x?", "What are different ways x is implemented?".

You need to focus on content and start learning to ask productive questions to help you become really interested in the content you are learning about, rather than treating it like some quiz you just study for. Be honest with yourself and with the interviewers. You don't need to prove your competence to yourself or overstress about looking competent to your interviewers, care about the content and they'll be able to see that you are good