Motivation is a downward and upward spiral. I like to kind of relate it to the Broken Window Theory. Basically, the theory is- that in order to stop big crimes such as theft and murder, you need to get rid of the small ones- such as litter, and graffiti. Might sound a bit off topic, but I assure you its not. I think individual lifestyles are like that, in order to be able to tackle the big things in life- such as jobs, homework, or driving lessons- we need to learn to tackle the small ones such as washing dishes or making your bed, and Im sorry to say- its not something you can do overnight, as the expression goes: Rome wasnt built in a day.
You need to be able to organize yourself, keep things tidy, wash dishes when the moment they need to be washed. You need to wake up and make your bed, clean the sink, etc. In order to do the larger things in life, you need to be able to do the small. But the moment youve pegged down the small things in life that require minimal motivation- its an upward spiral.
Good luck! You can do it if you truly put in the extra effort- and remember, you only have one life to live, so make it worthwhile!