Scared of ..

Hello, this is my first post on this blog. My introductions, my name is Kemi. Am a medical student studying in Eastern Europe. And i like to discuss,share and get views and suggestions from others.
That been said,
      Am in 5th year of medical school (6th year is the final year),as i get closer to achieving my goal of been a medical doctor, i get scared. Am afraid i don't know enough and have forgotten a lot of stuff i studied in the past. I don't know if this is normal, so i would like to hear from you. How do you feel, when you are close to getting something you've worked hard for but you are afraid you are not going to be good enough!