OP here's a story for you. I was averaging 30 on my AAMC. I took the mcat recently and came out of feeling uneasy - I was sure I had bombed it. As the day progressed I started second guessing myself and allowed my anxiety to fester. By the end of the day I was a hair away from a full blown panic attack and feeling completely depressed and defeated. This persisted for nearly a week after the test. As more time passed I slowly started to get more confident and realized a lot of other people had trouble with the passages I had problems with. I find out my score in less than a week, so will tell you if all this worrying was for nothing, but either way, there are plenty of people who do well that still feel the way you do.