You need to set explicit and attainable short-term and long-term goals for yourself.
When I started to quit smoking I had short term goals: gain 10 pounds in 2 months and increse my bench, squat and deadlift total by 100 pounds in to months. Saving money was also another goal.
I also had two long term goals: to play college Rugby and to be competing as a sucessful powerlifter.
Your goals can be as simple as: I will lift weight consistantly or I will save money and use it to take my girlfriend to expensive restaurants etc...
Now, I'm still working on the long term goals but by setting different goals and achieving them, it will help you mentally and by giving you a great deal of satisfaction and it will keep you on track.