Has anyone taken the AP Calculus AB Exam?

I just took it today and I feel as though I bombed everything. I can’t discuss it too in depth…it’s against the terms of agreement. But, being someone who has worked hard in Calculus all year long (I’m a senior in high school by the way), has studied consistently, and has been confident about knowing the material, I now feel as though it was all in vain. I left several things blank on the second section, the FR, and now I’m flustered. I haven’t really been too strong in math (unless I try) until now. And I know I made simple mistakes – I can remember then clearly. Tests can be my downfall. Is AP supposed to make you feel like this, or did I perhaps just have a mental shut down for a while?