Post interview spiraling

Every interview I've ever had, I've had an unstoppable anxiety spiral after. I've gotten offers but always feel like it's in spite of my interview skills rather than because of them. I overanalyze how much I rambled, how unprepared I was, what their facial expressions were... anyways, I'm doing this now for an interview I didn't really even care about. I wish that I had prepared better but... why? I already have offers for grad programs that I would probably prefer. It just becomes a self esteem issue at this point.

Not sure what I'm trying to achieve with this post other than seeing if anyone else feels the same.