Hey /personal/.

I have a relatively common and simple problem, I suppose, compared to what the other threads here seem to be about.
Often, I decide I want to spend a day working hard on whatever it is I want to get done, only to waste said day on stuff like browsing the Internet and realizing in the evening that I hardly did anything useful at all. I'm not sure whether I should call myself lazy or just easily distracted, but an obvious fact is that I don't have enough of a spine to make myself do what I should.
This seemingly compulsive procrastination is very bothersome, but the problem extends somewhat further than that. I general, I have trouble keeping promises I make to myself. For another example, I also decided that I should fap less, and tried to implement a once-every-two-days schedule starting with today as the first day of abstinence. But needless to say, I failed that already. And a similar pattern shows whenever I have large amounts of candy near me. (I see to it that I rarely do.)

In short, I lack discipline. Any advice on how to strengthen my willpower?