Overwhelmed with info and doubt

I just can't seem to shake this feeling. OK, let's face it, I am not stupid (people hate it when I say I am...), but I can't help feeling very overwhelmed by the amount of information that I need to learn to both pass my exams and to be great at my job. That feeling, of course, leads to self doubt. THAT is when I start to feel stupid and unworthy. And yet, there has to be a way. How many countless people have gone before me (even lately) and been able to successfully complete their residencies and their exams? I feel like if I could just go back to undergrad and have a week here or there off to study (Feb. Break, Easter, etc.) I could catch up. The reality is that if I got a week off all I would want to do is do nothing, so that won't work either. I guess the only way to know for sure if I can or can't do this is to keep trucking. In the infamous words of the blue fish (ironic! I can't remember her name!!) from "Finding Nemo", "Just keep swimming, keep on swimming...."