Well...what do you want motivation to do?
Learn a new skill? Quit an addiction? Get in shape? What?
As with all things you get people that can just decide one day, "I'm doing this. Anyone and anything getting in my way better **** right on off". Those people can just push through anything. Others need a reason. You don't just need to know the what and how, but the why. If you don't have the why you will give up when you get discouraged.
You sound like someone falling into the latter category needing a good reason. Find one and when the going get's tough, think of the reason why you started. If that does not keep driving you...your reason was not worth ****.