Don't be too hard on yourself. Human beings do not actually want to work. They usually find the motivation to work, in my opinion, from a feedback loop that takes place in relative short order. If you're a cashier and someone walks up to the check-out line, you HAVE to help them. It's unavoidable.

Customer walks in -> Sales person helps them
Cable repair guy goes into work -> Dispatch gives him an address to hit
Telemarketer sits at desk -> Slowly contemplates how worthless life is

I think most jobs FORCE you to work. What you do doesn't.

It's all about self-motivation. What helps me is a white board. What also helps me is being extremely thorough in breaking the project down into dozens and dozens of different parts, setting deadlines for each. It also helps if you're prepared with a bunch of questions and topics for clients (I'm a web developer too).

People just assume that you have to do all the work, but get them involved. If they do not want to be involved in the design process for their own site, f*** 'em. Steal their money. LOL With some convincing though, you can get most people on board.

The more you force communication by sending them mock-ups, design elements, progress reports, the more the feedback loop keeps you motivated. Working behind a computer is 100x more difficult because you have to be self-motivated. Don't be hard on yourself, just develop a routine and keep yourself invested in it.