Believe in love. Believe in magic. Hell, believe in Santa Clause. Believe in others. Believe in yourself. Believe in your dreams. If you don't, who will?
In Dreams... well, I was slightly overcompensating with that. I was a bit like a director for hire, so maybe I was putting too much imagery that was familiar to me into it.
Dream small dreams. If you make them too big, you get overwhelmed and you don't do anything. If you make small goals and accomplish them, it gives you the confidence to go on to higher goals.
Consult not your fears but your hopes and your dreams. Think not about your frustrations, but about your unfulfilled potential. Concern yourself not with what you tried and failed in, but with what it is still possible for you to do.