Heart ache

My heart was aching/itching again in the last few days. As usual its not very painful, just uncomfortable. It's like being squeezed genetly by someone who doesn't want to kill me but playing me in his/her hand. Its still bearable though. Sometimes I can almost feel that I have less time than everyone else I knew. What if today is my last day on earth? I am not afraid of dying just afraid of not living well enough. Besides, I still don't understand life.