Sometimes in the midst of adversity it's a very difficult choice to make, to remain positive. I believe that the more positive we are able to be the more positive events, energy, life, happiness and love we draw to ourselves.
For everything there is a time and season. There is a time of mouring, of sorrow of tears but then there is a time of happiness, joy and laugter. Grieve for a time but do not dwell.
It's by moving outside of ourselves and giving to others do we bring healing to our own pain and distress. I know this is not easy and goes against the grain in most of us (if were human and honest lol) but the more we do it the more positive energy and healing we bring into our own life.
So, I must say that while i'm not ALWAYS positive, I strive to be. I generally am a positive person and if not in one moment give me a minute and it will come.