I think you can be motivated in life (i) when you are afraid, or (ii) when you are in love. These are the two important forces that compel you to do, to take action.
When we are afraid, for example, of failure, we use all our energies to be successful, to achieve our aims and goals. When we are in love, we make efforts to do everything for our loved ones. We are excited about everything, and chase our dreams with motivation. We can truly love others only when we love ourselves, and to love ourselves, we need to be happy first. A depressed person does not love his/ her life, so they cannot love others; they are in extreme despair. In this world, no body is perfect, and we have to love ourselves and all our incompleteness.
I like this statement by John Lennon about fear and love and how it affects life.
“There are two basic motivating forces: fear and love. When we are afraid, we pull back from life. When we are in love, we open to all that life has to offer with passion, excitement, and acceptance. We need to learn to love ourselves first, in all our glory and our imperfections. If we cannot love ourselves, we cannot fully open to our ability to love others or our potential to create. Evolution and all hopes for a better world rest in the fearlessness and open-hearted vision of people who embrace life.”