I am a PhD student in the area of CS/math. My dream (for a long time) is to develop an academic career, and I work really hard (like any of us) to achieve that.
This semester I am taking a class which is semi relevant to my area. This class made me feel like a complete idiot. I have been spending hours on HW questions which other students solved quickly, it takes me a while to even understand parts of the solutions/concepts presented. This is very different from a struggle in research, where sometimes nothing works but at least you know that you are trying to solve something yet unsolved.
I know that the academic career path has so many struggles to come. However, this class kinda made me think that maybe I am not good enough for this type of theoretical research. How come other students invested so much less effort on that?
I guess I am looking for advice on this. Should I take that as a hint for actually not being able to do that type of research? Should I just forget about it? Have you been in such a situation?