I've often called myself very all-or-nothing. If a job's worth doing, it's worth spending the rest of your life on at the expense of everything else. Or that's what anybody would think I believed if they watched me for a while. I guess it's hyperfocus, perfectionism, special interests, and black-and-white thinking. Everything's like an obsession with me.
There was some Zen chappie who somebody asked, "what makes you Zen types different from everybody else?" and he replied that Zen people exactly the same things as everybody else, "but when we breathe, we really breathe (etc.). It's rather like that with me.