Lost Myself again~

I cant recognize myself again, what do I really wan? The "Road" I walking, is that my road? Am I on the right track? Is what I am doing right? Maybe I stress over the exam and all this negative thinking come back to find me again. All these day, I keep reading a book that can burn my spirit up, but cant last for long. I wonder why? I even set a motivation quote on my phone stand by screen to keep reminding myself. Last time I set a Principe for myself to follow but now i found out that my Principe cannot apply all the time then I get very lost. I also found out that, my emotion rise can drop very often and very fast, I am tired. I really wonder when I will be ok? I hope after exam I find back Myself~