I can assure you I am extremely motivated, and when I set my mind to something I usually succeed eventually. I only start studying for the PPL 3 weeks ago and have nailed 3 exams, Air Law, HP, and Met already. And that's at the same time of balancing a full time job, home life, house work, etc etc. I am very very focused and when I want something I work my ass off and make it happen.
I would imagine that the possibility of jacking it all in to follow the dream is surely enough to prove I am motivated.
I hear what you're saying though. What I would hate more than anything would be to get to the end of my days and regret not taking the gamble and following the dream. Sometimes life is about taking risks. When you look at the most successful people in this world i.e the Steve Jobs, Sir Alan Sugar's etc etc they didn't get to where they are by playing it safe. They both faced bankruptcy and the prospect of 'nothing' but they pushed and pushed and look at them now.