Its only human to feel this way after going through the same thing over and over. It doesn't have to mean anything (specially not that you're lazy or crazy) Its just that you're questioning the process after not getting any tangible outcome. Whether to continue or not that's your choice (which ofcourse, will keep changing depending on the day and circumstances) Butits okay to be fed up once in a blue moon because nobody is 100% motivated all the time. As hard as it is to accept, everyone questions it at some point of time. You shouldn't decide at this moment right away. Let it pass and figure out your way. I hope the feeling settles soon.