My future?

Actually now I feel vague about my future. I not yet understand myself. I do not know what do I want, what do I become. Even I do not know distinct my strong point. So I had do something do again complete with thing I should do. Example, my study result more and more to lag behind. My emotional badly and have a pessimistic attitude. I usually stay up too late, and go to school late. I am sluggish and tired of everything. I understand that is negative and it is needed delete but I do not how to change it. I live in morose days for a long time. But recently, things happened with me like a miracle. I had nice friends on media social. I gradually have nice relationship with classmate and fit in with the life now. I think I should change the habits of myself. Firstly, I do not complaint anymore. I have to calm down in situational everything. I keep to positive attitude and become optimist. I do not need to become likely extrovert. But I self image myself and confident with things that I chose. I want to have a meaningful lifestyle more.