Do these four things and you never fail to be positive. Always do all of them and you will be a positive person, it takes work, but it is worth it.
1. Be good at something, find something that you can be an expert at, like collecting things, or building things, or writing, etc.
2. Belong to something, find something that you can belong to, a church, study group, scouting, knitting, scrap booking, ceramics, card players, roadside cleaners, volunteer group, etc.
3. Give something, find some way to give to your fellow man, volunteer, work for habitat for humanity, help feed the homeless, collect gifts for children, decorate hospitals, etc.
4. Take care of yourself, eat right, exercise, groom, find a way to have spiritual experiences, laugh every day, and share yourself with others.