So recently i feel very exhausted and tired from all the bullshits around me. I have a prom these days, parties and all the stuffs for graduation but i have no energy for anything. Everybody around me are very happy and seem to have fun but not me. I know this is the best moment of every student's life and all but i can't enjoy it and i think some day i will regret it. I dont have motivation for anything and the exams are in one week. They are very important because my life is depending on them. 
Please tell me what to do. What's wrong with me?