Keeping my scholarship, making the grade

Hello all, this one might be a novel, sorry.

I recently have been awarded a full ride merit scholarship from my nursing school that pays for every school I have, room, board, books, tuition, fees; the whole nine yards. I still don't feel like I earned it, almost like I am an imposter. I never really got good grades in high school, and can't explain why I got good grades my first two years in college before I got accepted into my schools nursing program. I never really worked too hard (grades came very easy to me), or did anything that was exceptional (my extra crics were things I did for fun), yet I was given this gift and the letter that came with it applauded me for my achievements and hard work. This feeling of not deserving the scholarship is compounded by not being sure that I can keep my grades high enough in Nursing School to maintain the scholarship.

My first 60 hours, 4.0 no problem, never sweated a class and never pulled an all-nighter, never even got below an 80% on anything, even if I turned in what I thought was crap. Yet I don't think I retained very much either, I always intended to learn everything and not just memorize it, yet its all gone as if I crammed it. I never could retain stuff for a long time, and I am very worried that this will kill me in nursing school.

I can't talk to my friends or family about this, when I try they think I am being modest. If any of you an.comers out there have had a similar imposter feeling, please let me know how you coped with it. If you too made good grades each semester, but had difficulties recalling information later on, let me know how you coped with that. I am at a loggerheads with three different issues here and just need a starting point to get the ball rolling (and a recent study says that problem solving is easier when its someone elses problem).