Where your attention is, there is your energy. When your head is constantly occupied with thoughts about work, studies, projects, other people - there is no resource left for you.
Take time to take care of your physical and emotional state. For example: go for a walk, take a leisurely breakfast, go to a massage, do meditation and self-development, listen to music or stay in silence. Just to stop, reflect and understand what you want from life.
It is not necessary to be dispersed on dialogue with people which pull downwards, on affairs which it is not pleasant to be engaged. Your life is not sometime in the future, it goes right now. And it depends on you how to manage your precious time.
Do not know what to do - take care of yourself.
I want to "do good" to others and give uninvited advice - take care of yourself. It is more pleasant, useful and effective.