I need to meet my own expectations

Why do I say to myself that I am going to do something, or not do something, and then not follow through.

Okay, the example right now is the work that I bought home. I'm sitting here and have wasted so much time flicking through different blogs.

There are other things that I want to do, but never get around to.

I am going to have to start putting more things, little things on my to do list. To do lists more often get done. Is that just because I like to cross things off?