Well, if they're your friends then however you treat them it's up to you, I also like to mess with some girls from time to time, like that one time I put an ice cub between one's breasts... it was freaking hilarious, but I got hit with a Moore's Anathomy on the head... totally worth it. LOL
but yeah, still, try to show some more courage, I'm 100% sure none of your classmates either want or would dare to hurt you, you're in med school now, and even if people feel a bit unprofessional or the sort (just look at me, for Madoka's sake), they're all there because they're going to be doctors, and they know serious time has to be serious to a certain degree, no sane person plays around with needles, is what I'm saying, except for me, I play with scalpels all the time, but I'm skilled enough to not hurt anyone in the process... LOL

as for the studying, well, I read lying face down and with the book over my bed, just like teenage girls do on T.V., LOL but well, at least you exercise your arms a bit while holding it. As for your studies, well, it's just that most people get desperate at first because they're just basic sciences, I'm done with all that stuff now, so that's why I told you. Now it's all clinical application, so it's lots and lots of fun.I'll tell you something that is inevitable, once you get to where I am (halfway through my second year, there's 45% left of the people who entered school with me, but seeing as you're going through it without much effort, you'll be alright ;)