Baking Through My Journey As a Doctor to Be

i feel like the dumb-est student in my PBL gp and this makes me want to shut my mouth up for the rest of my life! i know i'm not bight and i'd enjoyed being so (at least it did not bother me so much) cause i know i need time to catch up and improve. but hell today's PBL had slapped me on my face. i know so LITTLE compared to my classmates. they are exceptionally brilliant which makes me extraordinarily stupid. i dun mind being the stupidest as long as the gap isn't too large but the truth is --> there's a HUGE HUGE gap between me and others. it's not that i did not do my research, i did but my brain is like a sieve, i forgot everything. things get worse because i did not try to understand everything at the first place, and after the process of forgetting, nth much is left in my brain (might as well call it 豆腐花 cause it doesn't work like a brain anyway). i am so beaten up, exam is on next friday and for sure i'm at the edge of failing if not already failed. what the hell is going on with lysozyme and the NAG NAM and hyperthermia dynamic thingy? and the most dangerous of all is i thought i know something which i actually don't -_-" this sucks, it makes me feel like my reading is never enough and my revision will never be done [which is somehow true] so what do i do now? study of course! but why am i always so sleepy?!?! i am not lazy (hopefully ^^) but i am always so tired. what have i got myself into? what is my expectation? these are questions to be answered before i carry on.