Does a certain person or an animal bring you happiness?  What about your home, car, or a material object?  Are you happy with you?  Are you happy when there’s no one or nothing else there?  Being happy with yourself is the most important part of life.  Why would you not be happy with youself?  Are you “thinking” about the past and what you did or should’ve done?  Are you worried about something (that hasn’t even happened yet)?  Seriously, ask yourself if you make you happy.  If your answer is no, or I don’t know, then you’ve got to dig deep and figure out why.  No one knows you better than you.  🙂