Who are you?

Who are you? When you say it in front of the mirror towards yourself, has it ever crossed your mind about questioning your real identity? Me myself always do that not only in front a mirror but at all time, especially when I'm alone. I just don't know have I struggled hard enough to explore everything I've got simply because I feel nothing lately. Have you come to that point? To feel that there's no life anymore in your soul. You might look happy and healthy and everything seems to be just fine, but in fact, deep down in the bottom of your heart, you feel dead. So, any advice for me to keep up my life?