Frustrated. . .

My grades have not been what I expected this semester. I have had more Bs than I would like and I have found it a struggle to get even those. Math (which has been my easiest subject in the past) is a struggle this time, and I have met with my professor twice outside of class, plus I visited the Math Tutoring Center this week for extra help on my Trig test today. I will find out what I made Friday, but I am pretty sure it was a B . . .or lower. My first test in there was also a B. I am trying to resign myself to these Bs but it is not easy for me.   Then there is genetics. Yesterday was our first test in there, and I left that room feeling pretty good. I was POSITIVE I had made an A.  Today he posted our grades and OH no, it was not an A. It was not a B. It was not a C. I have a D. The class average was a 58 and I earned a lovely 64. I hyperventilated outside of his office. He tried to reassure me that I would still end up with an A in his class. I left feeling panicky and shaky. This was NOT what I expected. I work my butt off and these are not the grades I want to be getting.

A part of me wonders: am i smart enough for this? Have I bitten off more than I can chew? What would I do if I wasn't doing this?