I am a 3rd-year computer engineering student at a mid-tier state school with a high GPA (3.97/4.0), top of my class, and 1 semester worth of research. I am also currently participating in a very prestigious REU program, so I do have a decent amount of research experience. I have also taken the GRE and done pretty well (mid 80s) percentile in verb/quant and 99th percentile in AWA. I've also basically narrowed down my research interests to 2 fields, so I have a general idea of what I'd like to specialize in. My goal is to become a Professor in Electrical and Computer Engineering, and I'm starting to contemplate applying to grad schools. I really want a PhD because I know that it is absolutely necessary for my goals.
My only problem is that I am afraid of doing the PhD, because I feel that I won't remember everything (or a good amount) of everything from undergrad. This especially scares me because despite my successes in undergrad, I'm not sure that I could pass the qualifying exams. I guess I'm just afraid of the unknown; do you think that I should just go for it?
Thanks, sorry if my question comes off as rambling; I really want to earn a PhD so I can be a professor or faculty member at some point and knowing that I could fail is very scary.