Something important

I'm very tired these days. But I am 19 years old. Fortunately, 19 years old is very young, strong, and fine! And that's a top of mountain of a life. Why am I tired? How long have I been tired? Maybe, because I’m doing different many things. And I have begun them since I was high school student. Those are increasing step by step. Should I just study? No, I believe that there’s something more important than a study. I think that people should do something they want to do if they are tired.