what is mean by living life to it's fullest?is it mean that living a life with a goal or is it living a life happily...i live happily once but now i've lost my happiness does this mean i already lived my life to the fullest before?or is it i have not live my life to my fullest

i feel that i'm just a walking corpes...it just a matter of time i really turn into one...today i got some of my prelim result...i've done so badly and those are the one i have confident but it turn out so badly done...i can't imagine my other subjects...it must be worse...i'm feeling so down now anyone can tell me what to do...

my title is back to square one again...but with some changes..."lonely man on earth"...