What is self discipline? Real discipline is when you have trained your mind in such way that you consistently get the behavior you want. Self discipline may appear to be a problem of willpower. “Willpower,” however, has connotations of just pushing ourselves harder to do things, even when we feel miserable, or fighting temptations. Notice the rewards of self discipline. The more you see the benefits, the more you’ll be motivated to continue the useful behaviors. Ask for assistance where you can get it.
If you can’t stop whining, for example, have friends point out when you’re doing it. However I do believe there is merit in having an outlet from which to write - as some by way of writing do have situations that are taking place in life. And there not the only ones we all are at different times. Reward yourself. Set behavioral goals and reward yourself for their completion. A writer, for example, could decide to write 20 pages per day, and reward himself when he reaches this goal. Imagine the consequences of your useful and damaging behaviors.
When you are tempted towards damaging behavior, see all the possible results, and be vivid in your imaginings. Give yourself a good scare, if you have to. When you are trying to get to work, see all the future rewards that are possible. Relax. Willpower is low when you’re stressed, so close your eyes and take three deep breaths.
Sometimes a little push with the willpower goes a long way.