Able or not able?

Nothing went on track about my academic at university level. Am i reaching my limits or i am just simply procrastinating? I started to doubt myself ever since i quit my job. Nothing feels right at the moment. I stay up late for studies, worked on pass year, pushing myself to understand but my brain just got malfunction in the critical period. I always believe in two words "i can" but the faith seems to fade. Who to blame? Me. Not taking good care of my mental status. Even choose to burn midnight oil to post this paragraph instead of keeping clearer mind for tomorrow exam. Stop being addictive! Fan lol lor.....